21989552863170 has 64 divisors (see below), whose sum is σ = 55211056392960. Its totient is φ = 5594510515968.

The previous prime is 21989552863163. The next prime is 21989552863177. The reversal of 21989552863170 is 7136825598912.

It is an interprime number because it is at equal distance from previous prime (21989552863163) and next prime (21989552863177).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21989552863177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40694209 + ... + 41231028.

It is an arithmetic number, because the mean of its divisors is an integer number (862672756140).

Almost surely, 2^{21989552863170} is an apocalyptic number.

21989552863170 is an abundant number, since it is smaller than the sum of its proper divisors (33221503529790).

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

21989552863170 is a wasteful number, since it uses less digits than its factorization.

21989552863170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81925659.

The product of its (nonzero) digits is 65318400, while the sum is 66.

The spelling of 21989552863170 in words is "twenty-one trillion, nine hundred eighty-nine billion, five hundred fifty-two million, eight hundred sixty-three thousand, one hundred seventy".