21077622225 has 72 divisors (see below), whose sum is σ = 42560574560. Its totient is φ = 10219413600.

The previous prime is 21077622221. The next prime is 21077622239. The reversal of 21077622225 is 52222677012.

21077622225 is a `hidden beast` number, since 2 + 1 + 0 + 7 + 7 + 622 + 2 + 25 = 666.

It is not a de Polignac number, because 21077622225 - 2² = 21077622221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21077622225.

It is not an unprimeable number, because it can be changed into a prime (21077622221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 47359 + ... + 210708.

Almost surely, 2^21077622225 is an apocalyptic number.

21077622225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21077622225 is an abundant number, since it is smaller than the sum of its proper divisors (21482952335).

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

21077622225 is a wasteful number, since it uses less digits than its factorization.

21077622225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258108 (or 258086 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 36.

The spelling of 21077622225 in words is "twenty-one billion, seventy-seven million, six hundred twenty-two thousand, two hundred twenty-five".