21329570955 has 64 divisors (see below), whose sum is σ = 43351262208. Its totient is φ = 8696962560.

The previous prime is 21329570953. The next prime is 21329570957. The reversal of 21329570955 is 55907592312.

It is an interprime number because it is at equal distance from previous prime (21329570953) and next prime (21329570957).

It is not a de Polignac number, because 21329570955 - 2¹ = 21329570953 is a prime.

It is a super-2 number, since 2×21329570955² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21329570953) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 113004 + ... + 235433.

It is an arithmetic number, because the mean of its divisors is an integer number (677363472).

Almost surely, 2^21329570955 is an apocalyptic number.

21329570955 is an abundant number, since it is smaller than the sum of its proper divisors (22021691253).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21329570955 is a wasteful number, since it uses less digits than its factorization.

21329570955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348516.

The product of its (nonzero) digits is 850500, while the sum is 48.

The spelling of 21329570955 in words is "twenty-one billion, three hundred twenty-nine million, five hundred seventy thousand, nine hundred fifty-five".