21452658 has 16 divisors (see below), whose sum is σ = 43044480. Its totient is φ = 7127696.

The previous prime is 21452611. The next prime is 21452659. The reversal of 21452658 is 85625412.

It is a plaindrome in base 11.

It is a zygodrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (21452659) 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, 3738 + ... + 7541.

It is an arithmetic number, because the mean of its divisors is an integer number (2690280).

Almost surely, 2^21452658 is an apocalyptic number.

21452658 is an abundant number, since it is smaller than the sum of its proper divisors (21591822).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21452658 is a wasteful number, since it uses less digits than its factorization.

21452658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11601.

The product of its digits is 19200, while the sum is 33.

The square root of 21452658 is about 4631.7014152469. The cubic root of 21452658 is about 277.8606430228.

It can be divided in two parts, 2 and 1452658, that added together give a triangular number (1452660 = T₁₇₀₄).

The spelling of 21452658 in words is "twenty-one million, four hundred fifty-two thousand, six hundred fifty-eight".