21275139400 has 48 divisors (see below), whose sum is σ = 49486832640. Its totient is φ = 8506248000.

The previous prime is 21275139383. The next prime is 21275139409. The reversal of 21275139400 is 493157212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21275139409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 447577 + ... + 492823.

It is an arithmetic number, because the mean of its divisors is an integer number (1030975680).

Almost surely, 2^21275139400 is an apocalyptic number.

21275139400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21275139400 is an abundant number, since it is smaller than the sum of its proper divisors (28211693240).

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

21275139400 is a wasteful number, since it uses less digits than its factorization.

21275139400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47614 (or 47605 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

The spelling of 21275139400 in words is "twenty-one billion, two hundred seventy-five million, one hundred thirty-nine thousand, four hundred".