21214165640 has 64 divisors (see below), whose sum is σ = 48080640960. Its totient is φ = 8423860480.

The previous prime is 21214165639. The next prime is 21214165691. The reversal of 21214165640 is 4656141212.

It is a junction number, because it is equal to n+sod(n) for n = 21214165597 and 21214165606.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 3866339 + ... + 3871821.

It is an arithmetic number, because the mean of its divisors is an integer number (751260015).

Almost surely, 2^21214165640 is an apocalyptic number.

21214165640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21214165640 is an abundant number, since it is smaller than the sum of its proper divisors (26866475320).

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

21214165640 is a wasteful number, since it uses less digits than its factorization.

21214165640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6182 (or 6178 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The spelling of 21214165640 in words is "twenty-one billion, two hundred fourteen million, one hundred sixty-five thousand, six hundred forty".