21650679 has 16 divisors (see below), whose sum is σ = 33111040. Its totient is φ = 13967640.

The previous prime is 21650653. The next prime is 21650683. The reversal of 21650679 is 97605612.

It is not a de Polignac number, because 21650679 - 2¹¹ = 21648631 is a prime.

It is a super-2 number, since 2×21650679² = 937503802322082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21650609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12097 + ... + 13770.

It is an arithmetic number, because the mean of its divisors is an integer number (2069440).

Almost surely, 2^21650679 is an apocalyptic number.

21650679 is a deficient number, since it is larger than the sum of its proper divisors (11460361).

21650679 is a wasteful number, since it uses less digits than its factorization.

21650679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25907 (or 25901 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 21650679 is about 4653.0290134492. The cubic root of 21650679 is about 278.7129664516.

The spelling of 21650679 in words is "twenty-one million, six hundred fifty thousand, six hundred seventy-nine".