21365622516351 has 16 divisors (see below), whose sum is σ = 30160172960640. Its totient is φ = 13416076925280.

The previous prime is 21365622516283. The next prime is 21365622516467. The reversal of 21365622516351 is 15361522656312.

It is not a de Polignac number, because 21365622516351 - 2¹¹ = 21365622514303 is a prime.

It is a super-2 number, since 2×21365622516351² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21365622516351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21365622514351) 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, 1083329685 + ... + 1083349406.

It is an arithmetic number, because the mean of its divisors is an integer number (1885010810040).

Almost surely, 2^{21365622516351} is an apocalyptic number.

21365622516351 is a deficient number, since it is larger than the sum of its proper divisors (8794550444289).

21365622516351 is a wasteful number, since it uses less digits than its factorization.

21365622516351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2166679286.

The product of its digits is 1944000, while the sum is 48.

The spelling of 21365622516351 in words is "twenty-one trillion, three hundred sixty-five billion, six hundred twenty-two million, five hundred sixteen thousand, three hundred fifty-one".