21890371704 has 16 divisors (see below), whose sum is σ = 54725929320. Its totient is φ = 7296790560.

The previous prime is 21890371703. The next prime is 21890371807. The reversal of 21890371704 is 40717309812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21890371703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 456049387 + ... + 456049434.

Almost surely, 2^21890371704 is an apocalyptic number.

21890371704 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21890371704 is an abundant number, since it is smaller than the sum of its proper divisors (32835557616).

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

21890371704 is a wasteful number, since it uses less digits than its factorization.

21890371704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 912098830 (or 912098826 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 42.

The spelling of 21890371704 in words is "twenty-one billion, eight hundred ninety million, three hundred seventy-one thousand, seven hundred four".