21373746 has 24 divisors (see below), whose sum is σ = 45101520. Its totient is φ = 6734016.

The previous prime is 21373717. The next prime is 21373771. The reversal of 21373746 is 64737312.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49146 + ... + 49578.

It is an arithmetic number, because the mean of its divisors is an integer number (1879230).

Almost surely, 2^21373746 is an apocalyptic number.

21373746 is an abundant number, since it is smaller than the sum of its proper divisors (23727774).

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

21373746 is an equidigital number, since it uses as much as digits as its factorization.

21373746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890 (or 457 counting only the distinct ones).

The product of its digits is 21168, while the sum is 33.

The square root of 21373746 is about 4623.1748831296. The cubic root of 21373746 is about 277.5195278848.

The spelling of 21373746 in words is "twenty-one million, three hundred seventy-three thousand, seven hundred forty-six".