20111100201021 has 16 divisors (see below), whose sum is σ = 27118340887680. Its totient is φ = 13255654832640.

The previous prime is 20111100201019. The next prime is 20111100201029. The reversal of 20111100201021 is 12010200111102.

It is not a de Polignac number, because 20111100201021 - 2¹ = 20111100201019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20111100200988 and 20111100201006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111100201029) 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, 102981 + ... + 6342933.

It is an arithmetic number, because the mean of its divisors is an integer number (1694896305480).

Almost surely, 2^{20111100201021} is an apocalyptic number.

It is an amenable number.

20111100201021 is a deficient number, since it is larger than the sum of its proper divisors (7007240686659).

20111100201021 is a wasteful number, since it uses less digits than its factorization.

20111100201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6252116.

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

Adding to 20111100201021 its reverse (12010200111102), we get a palindrome (32121300312123).

The spelling of 20111100201021 in words is "twenty trillion, one hundred eleven billion, one hundred million, two hundred one thousand, twenty-one".