1212022021020 has 96 divisors (see below), whose sum is σ = 3422272896000. Its totient is φ = 320488406784.

The previous prime is 1212022021013. The next prime is 1212022021027. The reversal of 1212022021020 is 201202202121.

It is an interprime number because it is at equal distance from previous prime (1212022021013) and next prime (1212022021027).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212022021027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5132301 + ... + 5363259.

It is an arithmetic number, because the mean of its divisors is an integer number (35648676000).

Almost surely, 2^{1212022021020} is an apocalyptic number.

1212022021020 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 1212022021020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1711136448000).

1212022021020 is an abundant number, since it is smaller than the sum of its proper divisors (2210250874980).

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

1212022021020 is a wasteful number, since it uses less digits than its factorization.

1212022021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231707 (or 231705 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 1212022021020 its reverse (201202202121), we get a palindrome (1413224223141).

The spelling of 1212022021020 in words is "one trillion, two hundred twelve billion, twenty-two million, twenty-one thousand, twenty".