21662342 has 16 divisors (see below), whose sum is σ = 35337120. Its totient is φ = 9899712.

The previous prime is 21662339. The next prime is 21662351. The reversal of 21662342 is 24326612.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1367 + ... + 6722.

It is an arithmetic number, because the mean of its divisors is an integer number (2208570).

Almost surely, 2^21662342 is an apocalyptic number.

21662342 is a deficient number, since it is larger than the sum of its proper divisors (13674778).

21662342 is a wasteful number, since it uses less digits than its factorization.

21662342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8207.

The product of its digits is 3456, while the sum is 26.

The square root of 21662342 is about 4654.2821143545. The cubic root of 21662342 is about 278.7630040787.

Adding to 21662342 its reverse (24326612), we get a palindrome (45988954).

The spelling of 21662342 in words is "twenty-one million, six hundred sixty-two thousand, three hundred forty-two".