1321210213020 has 144 divisors (see below), whose sum is σ = 4078152606528. Its totient is φ = 346140103680.

The previous prime is 1321210213009. The next prime is 1321210213031. The reversal of 1321210213020 is 203120121231.

1321210213020 is a `hidden beast` number, since 1 + 321 + 21 + 0 + 21 + 302 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (1321210213009) and next prime (1321210213031).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1321210212984 and 1321210213002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9339657 + ... + 9480063.

It is an arithmetic number, because the mean of its divisors is an integer number (28320504212).

Almost surely, 2^{1321210213020} is an apocalyptic number.

1321210213020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321210213020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2039076303264).

1321210213020 is an abundant number, since it is smaller than the sum of its proper divisors (2756942393508).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1321210213020 is a wasteful number, since it uses less digits than its factorization.

1321210213020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141340 (or 141335 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 1321210213020 its reverse (203120121231), we get a palindrome (1524330334251).

The spelling of 1321210213020 in words is "one trillion, three hundred twenty-one billion, two hundred ten million, two hundred thirteen thousand, twenty".