21977052280 has 64 divisors (see below), whose sum is σ = 49913496000. Its totient is φ = 8708404224.

The previous prime is 21977052271. The next prime is 21977052283. The reversal of 21977052280 is 8225077912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21977052283) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2785381 + ... + 2793259.

It is an arithmetic number, because the mean of its divisors is an integer number (779898375).

Almost surely, 2^21977052280 is an apocalyptic number.

21977052280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21977052280 is an abundant number, since it is smaller than the sum of its proper divisors (27936443720).

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

21977052280 is a wasteful number, since it uses less digits than its factorization.

21977052280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8536 (or 8532 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 43.

The spelling of 21977052280 in words is "twenty-one billion, nine hundred seventy-seven million, fifty-two thousand, two hundred eighty".