21559048900 has 27 divisors (see below), whose sum is σ = 46786322541. Its totient is φ = 8623032240.

The previous prime is 21559048897. The next prime is 21559048913. The reversal of 21559048900 is 984095512.

The square root of 21559048900 is 146830.

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., 7761257604 + 13797791296 = 88098^2 + 117464^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1460959 + ... + 1475641.

Almost surely, 2^21559048900 is an apocalyptic number.

21559048900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

21559048900 is the 146830-th square number.

It is an amenable number.

21559048900 is an abundant number, since it is smaller than the sum of its proper divisors (25227273641).

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

21559048900 is an frugal number, since it uses more digits than its factorization.

21559048900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29380 (or 14690 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 43.

The spelling of 21559048900 in words is "twenty-one billion, five hundred fifty-nine million, forty-eight thousand, nine hundred".