21501871348 has 12 divisors (see below), whose sum is σ = 37633832740. Its totient is φ = 10749347712.

The previous prime is 21501871253. The next prime is 21501871423. The reversal of 21501871348 is 84317810512.

It can be written as a sum of positive squares in 2 ways, for example, as 6103046884 + 15398824464 = 78122^2 + 124092^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21501871348.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 366261 + ... + 420892.

Almost surely, 2^21501871348 is an apocalyptic number.

It is an amenable number.

21501871348 is a deficient number, since it is larger than the sum of its proper divisors (16131961392).

21501871348 is a wasteful number, since it uses less digits than its factorization.

21501871348 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793986 (or 793984 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 40.

The spelling of 21501871348 in words is "twenty-one billion, five hundred one million, eight hundred seventy-one thousand, three hundred forty-eight".