21952051555 has 32 divisors (see below), whose sum is σ = 31570531200. Its totient is φ = 14334630912.

The previous prime is 21952051553. The next prime is 21952051579. The reversal of 21952051555 is 55515025912.

It is not a de Polignac number, because 21952051555 - 2¹ = 21952051553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21952051553) 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, 74040 + ... + 222229.

It is an arithmetic number, because the mean of its divisors is an integer number (986579100).

Almost surely, 2^21952051555 is an apocalyptic number.

21952051555 is a deficient number, since it is larger than the sum of its proper divisors (9618479645).

21952051555 is a wasteful number, since it uses less digits than its factorization.

21952051555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296383.

The product of its (nonzero) digits is 112500, while the sum is 40.

The spelling of 21952051555 in words is "twenty-one billion, nine hundred fifty-two million, fifty-one thousand, five hundred fifty-five".