21625901077266 has 16 divisors (see below), whose sum is σ = 48057557949600. Its totient is φ = 7208633692404.

The previous prime is 21625901077259. The next prime is 21625901077267. The reversal of 21625901077266 is 66277010952612.

It is a happy number.

21625901077266 is a `hidden beast` number, since 2 + 1 + 625 + 9 + 0 + 1 + 0 + 7 + 7 + 2 + 6 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 400479649579 = 21625901077266 / (2 + 1 + 6 + 2 + 5 + 9 + 0 + 1 + 0 + 7 + 7 + 2 + 6 + 6).

It is not an unprimeable number, because it can be changed into a prime (21625901077267) 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, 200239824736 + ... + 200239824843.

It is an arithmetic number, because the mean of its divisors is an integer number (3003597371850).

Almost surely, 2^{21625901077266} is an apocalyptic number.

21625901077266 is an abundant number, since it is smaller than the sum of its proper divisors (26431656872334).

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

21625901077266 is a wasteful number, since it uses less digits than its factorization.

21625901077266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400479649590 (or 400479649584 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 54.

The spelling of 21625901077266 in words is "twenty-one trillion, six hundred twenty-five billion, nine hundred one million, seventy-seven thousand, two hundred sixty-six".