21373430 has 24 divisors (see below), whose sum is σ = 41662512. Its totient is φ = 7891104.

The previous prime is 21373411. The next prime is 21373447. The reversal of 21373430 is 3437312.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21373396 and 21373405.

It is a congruent 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, 4634 + ... + 8013.

It is an arithmetic number, because the mean of its divisors is an integer number (1735938).

Almost surely, 2^21373430 is an apocalyptic number.

21373430 is a deficient number, since it is larger than the sum of its proper divisors (20289082).

21373430 is a wasteful number, since it uses less digits than its factorization.

21373430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12680 (or 12667 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 23.

The square root of 21373430 is about 4623.1407073547. The cubic root of 21373430 is about 277.5181602162.

The spelling of 21373430 in words is "twenty-one million, three hundred seventy-three thousand, four hundred thirty".