21372374 has 4 divisors (see below), whose sum is σ = 32058564. Its totient is φ = 10686186.

The previous prime is 21372367. The next prime is 21372413. The reversal of 21372374 is 47327312.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5343092 + ... + 5343095.

It is an arithmetic number, because the mean of its divisors is an integer number (8014641).

Almost surely, 2^21372374 is an apocalyptic number.

21372374 is a deficient number, since it is larger than the sum of its proper divisors (10686190).

21372374 is a wasteful number, since it uses less digits than its factorization.

21372374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10686189.

The product of its digits is 7056, while the sum is 29.

The square root of 21372374 is about 4623.0264978691. The cubic root of 21372374 is about 277.5135896816.

Adding to 21372374 its reverse (47327312), we get a palindrome (68699686).

The spelling of 21372374 in words is "twenty-one million, three hundred seventy-two thousand, three hundred seventy-four".