21252663031111 has 8 divisors (see below), whose sum is σ = 21285596827440. Its totient is φ = 21219731308608.

The previous prime is 21252663031087. The next prime is 21252663031123. The reversal of 21252663031111 is 11113036625212.

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

It is a cyclic number.

It is not a de Polignac number, because 21252663031111 - 2¹¹ = 21252663029063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21252663031811) 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, 20663035 + ... + 21667171.

It is an arithmetic number, because the mean of its divisors is an integer number (2660699603430).

Almost surely, 2^{21252663031111} is an apocalyptic number.

21252663031111 is a deficient number, since it is larger than the sum of its proper divisors (32933796329).

21252663031111 is a wasteful number, since it uses less digits than its factorization.

21252663031111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1036913.

The product of its (nonzero) digits is 12960, while the sum is 34.

Adding to 21252663031111 its reverse (11113036625212), we get a palindrome (32365699656323).

The spelling of 21252663031111 in words is "twenty-one trillion, two hundred fifty-two billion, six hundred sixty-three million, thirty-one thousand, one hundred eleven".