20121011100021 has 32 divisors (see below), whose sum is σ = 28914284302848. Its totient is φ = 12372488694720.

The previous prime is 20121011099977. The next prime is 20121011100023. The reversal of 20121011100021 is 12000111012102.

It is not a de Polignac number, because 20121011100021 - 2¹³ = 20121011091829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121011100023) 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, 303236170 + ... + 303302516.

It is an arithmetic number, because the mean of its divisors is an integer number (903571384464).

Almost surely, 2^{20121011100021} is an apocalyptic number.

It is an amenable number.

20121011100021 is a deficient number, since it is larger than the sum of its proper divisors (8793273202827).

20121011100021 is a wasteful number, since it uses less digits than its factorization.

20121011100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72321.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20121011100021 its reverse (12000111012102), we get a palindrome (32121122112123).

The spelling of 20121011100021 in words is "twenty trillion, one hundred twenty-one billion, eleven million, one hundred thousand, twenty-one".