21132410 has 16 divisors (see below), whose sum is σ = 40964616. Its totient is φ = 7802688.

The previous prime is 21132383. The next prime is 21132481. The reversal of 21132410 is 1423112.

It is a Cunningham number, because it is equal to 4597²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 15689521 + 5442889 = 3961^2 + 2333^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81149 + ... + 81408.

Almost surely, 2^21132410 is an apocalyptic number.

21132410 is a deficient number, since it is larger than the sum of its proper divisors (19832206).

21132410 is a wasteful number, since it uses less digits than its factorization.

21132410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162577.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21132410 is about 4597.0001087666. Note that the first 3 decimals coincide. The cubic root of 21132410 is about 276.4710589736.

Adding to 21132410 its reverse (1423112), we get a palindrome (22555522).

The spelling of 21132410 in words is "twenty-one million, one hundred thirty-two thousand, four hundred ten".