21374263644640 has 48 divisors (see below), whose sum is σ = 50505182674128. Its totient is φ = 8548268875776.

The previous prime is 21374263644631. The next prime is 21374263644641. The reversal of 21374263644640 is 4644636247312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21374263644641) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 10267842 + ... + 12172801.

It is an arithmetic number, because the mean of its divisors is an integer number (1052191305711).

Almost surely, 2^{21374263644640} is an apocalyptic number.

21374263644640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21374263644640 is an abundant number, since it is smaller than the sum of its proper divisors (29130919029488).

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

21374263644640 is a wasteful number, since it uses less digits than its factorization.

21374263644640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22446611 (or 22446603 counting only the distinct ones).

The product of its (nonzero) digits is 13934592, while the sum is 52.

The spelling of 21374263644640 in words is "twenty-one trillion, three hundred seventy-four billion, two hundred sixty-three million, six hundred forty-four thousand, six hundred forty".