21739022 has 16 divisors (see below), whose sum is σ = 35115120. Its totient is φ = 10055808.

The previous prime is 21739019. The next prime is 21739031. The reversal of 21739022 is 22093712.

It is a junction number, because it is equal to n+sod(n) for n = 21738982 and 21739000.

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 in 7 ways as a sum of consecutive naturals, for example, 3413 + ... + 7424.

It is an arithmetic number, because the mean of its divisors is an integer number (2194695).

Almost surely, 2^21739022 is an apocalyptic number.

21739022 is a deficient number, since it is larger than the sum of its proper divisors (13376098).

21739022 is a wasteful number, since it uses less digits than its factorization.

21739022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10915.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 21739022 is about 4662.5124128521. The cubic root of 21739022 is about 279.0915369621.

The spelling of 21739022 in words is "twenty-one million, seven hundred thirty-nine thousand, twenty-two".