21370648838 has 64 divisors (see below), whose sum is σ = 40295743488. Its totient is φ = 8257813920.

The previous prime is 21370648837. The next prime is 21370648841. The reversal of 21370648838 is 83884607312.

It is a super-2 number, since 2×21370648838² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21370648837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10541981 + ... + 10544007.

It is an arithmetic number, because the mean of its divisors is an integer number (629620992).

Almost surely, 2^21370648838 is an apocalyptic number.

21370648838 is a deficient number, since it is larger than the sum of its proper divisors (18925094650).

21370648838 is a wasteful number, since it uses less digits than its factorization.

21370648838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2577.

The product of its (nonzero) digits is 1548288, while the sum is 50.

The spelling of 21370648838 in words is "twenty-one billion, three hundred seventy million, six hundred forty-eight thousand, eight hundred thirty-eight".