20121122001020 has 72 divisors (see below), whose sum is σ = 43289817292176. Its totient is φ = 7855672061952.

The previous prime is 20121122001011. The next prime is 20121122001023. The reversal of 20121122001020 is 2010022112102.

It is a junction number, because it is equal to n+sod(n) for n = 20121122000986 and 20121122001004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121122001023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9914879 + ... + 11770601.

Almost surely, 2^{20121122001020} is an apocalyptic number.

20121122001020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121122001020 is an abundant number, since it is smaller than the sum of its proper divisors (23168695291156).

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

20121122001020 is a wasteful number, since it uses less digits than its factorization.

20121122001020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1856031 (or 1855976 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20121122001020 its reverse (2010022112102), we get a palindrome (22131144113122).

The spelling of 20121122001020 in words is "twenty trillion, one hundred twenty-one billion, one hundred twenty-two million, one thousand, twenty".