21002374 has 8 divisors (see below), whose sum is σ = 31733928. Its totient is φ = 10424400.

The previous prime is 21002357. The next prime is 21002389. The reversal of 21002374 is 47320012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38052 + ... + 38599.

It is an arithmetic number, because the mean of its divisors is an integer number (3966741).

Almost surely, 2^21002374 is an apocalyptic number.

21002374 is a deficient number, since it is larger than the sum of its proper divisors (10731554).

21002374 is a wasteful number, since it uses less digits than its factorization.

21002374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76790.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 21002374 is about 4582.8347122714. The cubic root of 21002374 is about 275.9028135734.

Adding to 21002374 its reverse (47320012), we get a palindrome (68322386).

The spelling of 21002374 in words is "twenty-one million, two thousand, three hundred seventy-four".