21249279270 has 24 divisors (see below), whose sum is σ = 55248126336. Its totient is φ = 5666474448.

The previous prime is 21249279269. The next prime is 21249279323. The reversal of 21249279270 is 7297294212.

It is a happy number.

21249279270 is a `hidden beast` number, since 2 + 1 + 2 + 492 + 7 + 92 + 70 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 118051462 + ... + 118051641.

It is an arithmetic number, because the mean of its divisors is an integer number (2302005264).

Almost surely, 2^21249279270 is an apocalyptic number.

21249279270 is an abundant number, since it is smaller than the sum of its proper divisors (33998847066).

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

21249279270 is a wasteful number, since it uses less digits than its factorization.

21249279270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236103116 (or 236103113 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The spelling of 21249279270 in words is "twenty-one billion, two hundred forty-nine million, two hundred seventy-nine thousand, two hundred seventy".