21156026212023 has 8 divisors (see below), whose sum is σ = 29867331122928. Its totient is φ = 13274369387904.

The previous prime is 21156026211977. The next prime is 21156026212051. The reversal of 21156026212023 is 32021262065112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21156026212023 - 2¹³ = 21156026203831 is a prime.

It is a super-2 number, since 2×21156026212023² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21156026216023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207412021636 + ... + 207412021737.

It is an arithmetic number, because the mean of its divisors is an integer number (3733416390366).

Almost surely, 2^{21156026212023} is an apocalyptic number.

21156026212023 is a deficient number, since it is larger than the sum of its proper divisors (8711304910905).

21156026212023 is a wasteful number, since it uses less digits than its factorization.

21156026212023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414824043393.

The product of its (nonzero) digits is 17280, while the sum is 33.

Adding to 21156026212023 its reverse (32021262065112), we get a palindrome (53177288277135).

The spelling of 21156026212023 in words is "twenty-one trillion, one hundred fifty-six billion, twenty-six million, two hundred twelve thousand, twenty-three".