21364658 has 16 divisors (see below), whose sum is σ = 36728640. Its totient is φ = 9130416.

The previous prime is 21364657. The next prime is 21364661. The reversal of 21364658 is 85646312.

It is a super-2 number, since 2×21364658² = 912897222913928, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21364657) 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, 3485 + ... + 7407.

It is an arithmetic number, because the mean of its divisors is an integer number (2295540).

Almost surely, 2^21364658 is an apocalyptic number.

21364658 is a deficient number, since it is larger than the sum of its proper divisors (15363982).

21364658 is a wasteful number, since it uses less digits than its factorization.

21364658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4321.

The product of its digits is 34560, while the sum is 35.

The square root of 21364658 is about 4622.1919042809. The cubic root of 21364658 is about 277.4801890464.

It can be divided in two parts, 21364 and 658, that added together give a palindrome (22022).

The spelling of 21364658 in words is "twenty-one million, three hundred sixty-four thousand, six hundred fifty-eight".