21274380648 has 32 divisors (see below), whose sum is σ = 59095502400. Its totient is φ = 7091460144.

The previous prime is 21274380643. The next prime is 21274380661. The reversal of 21274380648 is 84608347212.

It is a happy number.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21274380643) 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, 49246036 + ... + 49246467.

It is an arithmetic number, because the mean of its divisors is an integer number (1846734450).

Almost surely, 2^21274380648 is an apocalyptic number.

It is an amenable number.

21274380648 is an abundant number, since it is smaller than the sum of its proper divisors (37821121752).

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

21274380648 is a wasteful number, since it uses less digits than its factorization.

21274380648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98492518 (or 98492508 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 45.

The spelling of 21274380648 in words is "twenty-one billion, two hundred seventy-four million, three hundred eighty thousand, six hundred forty-eight".