21122577276 has 12 divisors (see below), whose sum is σ = 49286013672. Its totient is φ = 7040859088.

The previous prime is 21122577271. The next prime is 21122577293. The reversal of 21122577276 is 67277522112.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122577271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 880107375 + ... + 880107398.

It is an arithmetic number, because the mean of its divisors is an integer number (4107167806).

Almost surely, 2^21122577276 is an apocalyptic number.

It is an amenable number.

21122577276 is an abundant number, since it is smaller than the sum of its proper divisors (28163436396).

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

21122577276 is a wasteful number, since it uses less digits than its factorization.

21122577276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1760214780 (or 1760214778 counting only the distinct ones).

The product of its digits is 164640, while the sum is 42.

The spelling of 21122577276 in words is "twenty-one billion, one hundred twenty-two million, five hundred seventy-seven thousand, two hundred seventy-six".