21610942 has 8 divisors (see below), whose sum is σ = 34122600. Its totient is φ = 10236744.

The previous prime is 21610931. The next prime is 21610943. The reversal of 21610942 is 24901612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21610943) 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 3 ways as a sum of consecutive naturals, for example, 284317 + ... + 284392.

It is an arithmetic number, because the mean of its divisors is an integer number (4265325).

Almost surely, 2^21610942 is an apocalyptic number.

21610942 is a deficient number, since it is larger than the sum of its proper divisors (12511658).

21610942 is a wasteful number, since it uses less digits than its factorization.

21610942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568730.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 21610942 is about 4648.7570381770. The cubic root of 21610942 is about 278.5423482496.

The spelling of 21610942 in words is "twenty-one million, six hundred ten thousand, nine hundred forty-two".