21113562455351 has 24 divisors (see below), whose sum is σ = 22823258950800. Its totient is φ = 19518512436864.

The previous prime is 21113562455327. The next prime is 21113562455407. The reversal of 21113562455351 is 15355426531112.

It is a de Polignac number, because none of the positive numbers 2^k-21113562455351 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 (21113562455311) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15635321 + ... + 16931933.

It is an arithmetic number, because the mean of its divisors is an integer number (950969122950).

Almost surely, 2^{21113562455351} is an apocalyptic number.

21113562455351 is a deficient number, since it is larger than the sum of its proper divisors (1709696495449).

21113562455351 is a wasteful number, since it uses less digits than its factorization.

21113562455351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1297743 (or 1297724 counting only the distinct ones).

The product of its digits is 540000, while the sum is 44.

Adding to 21113562455351 its reverse (15355426531112), we get a palindrome (36468988986463).

The spelling of 21113562455351 in words is "twenty-one trillion, one hundred thirteen billion, five hundred sixty-two million, four hundred fifty-five thousand, three hundred fifty-one".