21662374 has 8 divisors (see below), whose sum is σ = 32693400. Its totient is φ = 10764576.

The previous prime is 21662363. The next prime is 21662387. The reversal of 21662374 is 47326612.

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32899 + ... + 33550.

It is an arithmetic number, because the mean of its divisors is an integer number (4086675).

Almost surely, 2^21662374 is an apocalyptic number.

21662374 is a deficient number, since it is larger than the sum of its proper divisors (11031026).

21662374 is a wasteful number, since it uses less digits than its factorization.

21662374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66614.

The product of its digits is 12096, while the sum is 31.

The square root of 21662374 is about 4654.2855520477. The cubic root of 21662374 is about 278.7631413432.

Adding to 21662374 its reverse (47326612), we get a palindrome (68988986).

The spelling of 21662374 in words is "twenty-one million, six hundred sixty-two thousand, three hundred seventy-four".