21768274902 has 32 divisors (see below), whose sum is σ = 47501218944. Its totient is φ = 6595502400.

The previous prime is 21768274889. The next prime is 21768274909. The reversal of 21768274902 is 20947286712.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21768274909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 543033 + ... + 581739.

It is an arithmetic number, because the mean of its divisors is an integer number (1484413092).

Almost surely, 2^21768274902 is an apocalyptic number.

21768274902 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21768274902 is an abundant number, since it is smaller than the sum of its proper divisors (25732944042).

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

21768274902 is a wasteful number, since it uses less digits than its factorization.

21768274902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47244.

The product of its (nonzero) digits is 677376, while the sum is 48.

The spelling of 21768274902 in words is "twenty-one billion, seven hundred sixty-eight million, two hundred seventy-four thousand, nine hundred two".