21122552896 has 63 divisors (see below), whose sum is σ = 43166437797. Its totient is φ = 10254908160.

The previous prime is 21122552881. The next prime is 21122552917. The reversal of 21122552896 is 69825522112.

The square root of 21122552896 is 145336.

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

It can be written as a sum of positive squares in only one way, i.e., 18900750400 + 2221802496 = 137480^2 + 47136^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 43019211 + ... + 43019701.

Almost surely, 2^21122552896 is an apocalyptic number.

21122552896 is the 145336-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21122552896

21122552896 is an abundant number, since it is smaller than the sum of its proper divisors (22043884901).

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

21122552896 is an frugal number, since it uses more digits than its factorization.

21122552896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1068 (or 530 counting only the distinct ones).

The product of its digits is 172800, while the sum is 43.

The spelling of 21122552896 in words is "twenty-one billion, one hundred twenty-two million, five hundred fifty-two thousand, eight hundred ninety-six".