21113161030551 has 16 divisors (see below), whose sum is σ = 28210460976000. Its totient is φ = 14045657218080.

The previous prime is 21113161030543. The next prime is 21113161030561. The reversal of 21113161030551 is 15503016131112.

It is not a de Polignac number, because 21113161030551 - 2³ = 21113161030543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113161030561) 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, 12630841 + ... + 14204381.

It is an arithmetic number, because the mean of its divisors is an integer number (1763153811000).

Almost surely, 2^{21113161030551} is an apocalyptic number.

21113161030551 is a deficient number, since it is larger than the sum of its proper divisors (7097299945449).

21113161030551 is a wasteful number, since it uses less digits than its factorization.

21113161030551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1583006.

The product of its (nonzero) digits is 2700, while the sum is 30.

Adding to 21113161030551 its reverse (15503016131112), we get a palindrome (36616177161663).

The spelling of 21113161030551 in words is "twenty-one trillion, one hundred thirteen billion, one hundred sixty-one million, thirty thousand, five hundred fifty-one".