21937246 has 4 divisors (see below), whose sum is σ = 32905872. Its totient is φ = 10968622.

The previous prime is 21937241. The next prime is 21937261. The reversal of 21937246 is 64273912.

21937246 is nontrivially palindromic in base 15.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21937241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5484310 + ... + 5484313.

It is an arithmetic number, because the mean of its divisors is an integer number (8226468).

Almost surely, 2^21937246 is an apocalyptic number.

21937246 is a deficient number, since it is larger than the sum of its proper divisors (10968626).

21937246 is a wasteful number, since it uses less digits than its factorization.

21937246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10968625.

The product of its digits is 18144, while the sum is 34.

The square root of 21937246 is about 4683.7213836863. The cubic root of 21937246 is about 279.9372563493.

The spelling of 21937246 in words is "twenty-one million, nine hundred thirty-seven thousand, two hundred forty-six".