21004660236 has 48 divisors (see below), whose sum is σ = 56024188416. Its totient is φ = 6000071424.

The previous prime is 21004660223. The next prime is 21004660249. The reversal of 21004660236 is 63206640012.

It is an interprime number because it is at equal distance from previous prime (21004660223) and next prime (21004660249).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 421345 + ... + 468551.

It is an arithmetic number, because the mean of its divisors is an integer number (1167170592).

Almost surely, 2^21004660236 is an apocalyptic number.

It is an amenable number.

21004660236 is an abundant number, since it is smaller than the sum of its proper divisors (35019528180).

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

21004660236 is a wasteful number, since it uses less digits than its factorization.

21004660236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52518 (or 52516 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The spelling of 21004660236 in words is "twenty-one billion, four million, six hundred sixty thousand, two hundred thirty-six".