21266275760 has 20 divisors (see below), whose sum is σ = 49444091328. Its totient is φ = 8506510272.

The previous prime is 21266275759. The next prime is 21266275763. The reversal of 21266275760 is 6757266212.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (21266275763) 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, 132914144 + ... + 132914303.

Almost surely, 2^21266275760 is an apocalyptic number.

21266275760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21266275760 is an abundant number, since it is smaller than the sum of its proper divisors (28177815568).

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

21266275760 is a wasteful number, since it uses less digits than its factorization.

21266275760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265828460 (or 265828454 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 44.

The spelling of 21266275760 in words is "twenty-one billion, two hundred sixty-six million, two hundred seventy-five thousand, seven hundred sixty".