21161002251160 has 32 divisors (see below), whose sum is σ = 47660010676560. Its totient is φ = 8455911014016.

The previous prime is 21161002251139. The next prime is 21161002251161. The reversal of 21161002251160 is 6115220016112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21161002251161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 265268574 + ... + 265348333.

Almost surely, 2^{21161002251160} is an apocalyptic number.

21161002251160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21161002251160 is an abundant number, since it is smaller than the sum of its proper divisors (26499008425400).

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

21161002251160 is a wasteful number, since it uses less digits than its factorization.

21161002251160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530617915 (or 530617911 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 28.

Adding to 21161002251160 its reverse (6115220016112), we get a palindrome (27276222267272).

The spelling of 21161002251160 in words is "twenty-one trillion, one hundred sixty-one billion, two million, two hundred fifty-one thousand, one hundred sixty".