21620327418 has 48 divisors (see below), whose sum is σ = 48440392416. Its totient is φ = 6965244000.

The previous prime is 21620327387. The next prime is 21620327423. The reversal of 21620327418 is 81472302612.

It is a happy number.

21620327418 is a `hidden beast` number, since 2 + 1 + 620 + 3 + 27 + 4 + 1 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 105208 + ... + 233043.

It is an arithmetic number, because the mean of its divisors is an integer number (1009174842).

Almost surely, 2^21620327418 is an apocalyptic number.

21620327418 is an abundant number, since it is smaller than the sum of its proper divisors (26820064998).

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

21620327418 is a wasteful number, since it uses less digits than its factorization.

21620327418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338379 (or 338376 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The spelling of 21620327418 in words is "twenty-one billion, six hundred twenty million, three hundred twenty-seven thousand, four hundred eighteen".