21502162055 has 32 divisors (see below), whose sum is σ = 28952209728. Its totient is φ = 15192576000.

The previous prime is 21502162051. The next prime is 21502162081. The reversal of 21502162055 is 55026120512.

It is not a de Polignac number, because 21502162055 - 2² = 21502162051 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 (21502162051) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1418999 + ... + 1434071.

It is an arithmetic number, because the mean of its divisors is an integer number (904756554).

Almost surely, 2^21502162055 is an apocalyptic number.

21502162055 is a deficient number, since it is larger than the sum of its proper divisors (7450047673).

21502162055 is a wasteful number, since it uses less digits than its factorization.

21502162055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15827.

The product of its (nonzero) digits is 6000, while the sum is 29.

Adding to 21502162055 its reverse (55026120512), we get a palindrome (76528282567).

The spelling of 21502162055 in words is "twenty-one billion, five hundred two million, one hundred sixty-two thousand, fifty-five".