21452289156 has 135 divisors (see below), whose sum is σ = 57356191431. Its totient is φ = 6991700976.

The previous prime is 21452289143. The next prime is 21452289179. The reversal of 21452289156 is 65198225412.

The square root of 21452289156 is 146466.

It is a perfect power (a square), and thus also a powerful number.

21452289156 is a `hidden beast` number, since 21 + 452 + 28 + 9 + 156 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 208274601 + ... + 208274703.

Almost surely, 2^21452289156 is an apocalyptic number.

21452289156 is the 146466-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21452289156

21452289156 is an abundant number, since it is smaller than the sum of its proper divisors (35903902275).

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

21452289156 is an equidigital number, since it uses as much as digits as its factorization.

21452289156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380 (or 187 counting only the distinct ones).

The product of its digits is 345600, while the sum is 45.

The spelling of 21452289156 in words is "twenty-one billion, four hundred fifty-two million, two hundred eighty-nine thousand, one hundred fifty-six".