21610671 has 8 divisors (see below), whose sum is σ = 28841904. Its totient is φ = 14393280.

The previous prime is 21610669. The next prime is 21610681. The reversal of 21610671 is 17601612.

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

It is not a de Polignac number, because 21610671 - 2¹ = 21610669 is a prime.

It is a super-2 number, since 2×21610671² = 934042202140482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21610661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1011 + ... + 6651.

It is an arithmetic number, because the mean of its divisors is an integer number (3605238).

Almost surely, 2^21610671 is an apocalyptic number.

21610671 is a deficient number, since it is larger than the sum of its proper divisors (7231233).

21610671 is a wasteful number, since it uses less digits than its factorization.

21610671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6921.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 21610671 is about 4648.7278905094. The cubic root of 21610671 is about 278.5411839429.

The spelling of 21610671 in words is "twenty-one million, six hundred ten thousand, six hundred seventy-one".