21021202100111 has 4 divisors (see below), whose sum is σ = 21083579554752. Its totient is φ = 20958824645472.

The previous prime is 21021202100021. The next prime is 21021202100131. The reversal of 21021202100111 is 11100120212012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21021202100111 - 2²⁶ = 21021134991247 is a prime.

It is a super-2 number, since 2×21021202100111² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021202100131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31188726815 + ... + 31188727488.

It is an arithmetic number, because the mean of its divisors is an integer number (5270894888688).

Almost surely, 2^{21021202100111} is an apocalyptic number.

21021202100111 is a deficient number, since it is larger than the sum of its proper divisors (62377454641).

21021202100111 is an equidigital number, since it uses as much as digits as its factorization.

21021202100111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62377454640.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21021202100111 its reverse (11100120212012), we get a palindrome (32121322312123).

The spelling of 21021202100111 in words is "twenty-one trillion, twenty-one billion, two hundred two million, one hundred thousand, one hundred eleven".