21616052502155 has 16 divisors (see below), whose sum is σ = 25965798112800. Its totient is φ = 17275155306240.

The previous prime is 21616052502139. The next prime is 21616052502167. The reversal of 21616052502155 is 55120525061612.

It is not a de Polignac number, because 21616052502155 - 2⁴ = 21616052502139 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52320431 + ... + 52731959.

It is an arithmetic number, because the mean of its divisors is an integer number (1622862382050).

Almost surely, 2^{21616052502155} is an apocalyptic number.

21616052502155 is a deficient number, since it is larger than the sum of its proper divisors (4349745610645).

21616052502155 is a wasteful number, since it uses less digits than its factorization.

21616052502155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422254.

The product of its (nonzero) digits is 180000, while the sum is 41.

Adding to 21616052502155 its reverse (55120525061612), we get a palindrome (76736577563767).

The spelling of 21616052502155 in words is "twenty-one trillion, six hundred sixteen billion, fifty-two million, five hundred two thousand, one hundred fifty-five".