21610022 has 16 divisors (see below), whose sum is σ = 37331712. Its totient is φ = 9189960.

The previous prime is 21610019. The next prime is 21610027. The reversal of 21610022 is 22001612.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 21609979 and 21610006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21610027) by changing a digit.

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, 4058 + ... + 7725.

It is an arithmetic number, because the mean of its divisors is an integer number (2333232).

Almost surely, 2^21610022 is an apocalyptic number.

21610022 is a deficient number, since it is larger than the sum of its proper divisors (15721690).

21610022 is a wasteful number, since it uses less digits than its factorization.

21610022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11923.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21610022 is about 4648.6580859427. The cubic root of 21610022 is about 278.5383955822.

Adding to 21610022 its reverse (22001612), we get a palindrome (43611634).

The spelling of 21610022 in words is "twenty-one million, six hundred ten thousand, twenty-two".