1213221033020 has 48 divisors (see below), whose sum is σ = 2681968212000. Its totient is φ = 459727856640.

The previous prime is 1213221032999. The next prime is 1213221033029. The reversal of 1213221033020 is 203301223121.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1213221032983 and 1213221033001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213221033029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12003656 + ... + 12104304.

It is an arithmetic number, because the mean of its divisors is an integer number (55874337750).

Almost surely, 2^{1213221033020} is an apocalyptic number.

1213221033020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213221033020 is an abundant number, since it is smaller than the sum of its proper divisors (1468747178980).

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

1213221033020 is a wasteful number, since it uses less digits than its factorization.

1213221033020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132398 (or 132396 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 1213221033020 its reverse (203301223121), we get a palindrome (1416522256141).

The spelling of 1213221033020 in words is "one trillion, two hundred thirteen billion, two hundred twenty-one million, thirty-three thousand, twenty".