21775251516612 has 48 divisors (see below), whose sum is σ = 58688378425152. Its totient is φ = 6210410414080.

The previous prime is 21775251516541. The next prime is 21775251516631. The reversal of 21775251516612 is 21661515257712.

It is a super-2 number, since 2×21775251516612² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4851880893 + ... + 4851885380.

It is an arithmetic number, because the mean of its divisors is an integer number (1222674550524).

Almost surely, 2^{21775251516612} is an apocalyptic number.

21775251516612 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21775251516612 is an abundant number, since it is smaller than the sum of its proper divisors (36913126908540).

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

21775251516612 is a wasteful number, since it uses less digits than its factorization.

21775251516612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9703766308 (or 9703766306 counting only the distinct ones).

The product of its digits is 1764000, while the sum is 51.

The spelling of 21775251516612 in words is "twenty-one trillion, seven hundred seventy-five billion, two hundred fifty-one million, five hundred sixteen thousand, six hundred twelve".