21610051 has 8 divisors (see below), whose sum is σ = 21874320. Its totient is φ = 21347712.

The previous prime is 21610027. The next prime is 21610067. The reversal of 21610051 is 15001612.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21610051 - 2⁵ = 21610019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21610081) 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, 37695 + ... + 38263.

It is an arithmetic number, because the mean of its divisors is an integer number (2734290).

Almost surely, 2^21610051 is an apocalyptic number.

21610051 is a deficient number, since it is larger than the sum of its proper divisors (264269).

21610051 is a wasteful number, since it uses less digits than its factorization.

21610051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 21610051 is about 4648.6612051213. The cubic root of 21610051 is about 278.5385201788.

Adding to 21610051 its reverse (15001612), we get a palindrome (36611663).

The spelling of 21610051 in words is "twenty-one million, six hundred ten thousand, fifty-one".