21265222276 has 27 divisors (see below), whose sum is σ = 39541193839. Its totient is φ = 10004830208.

The previous prime is 21265222213. The next prime is 21265222331. The reversal of 21265222276 is 67222256212.

The square root of 21265222276 is 145826.

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

It can be written as a sum of positive squares in 4 ways, for example, as 11705076100 + 9560146176 = 108190^2 + 97776^2 .

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, 4955940 + ... + 4960228.

Almost surely, 2^21265222276 is an apocalyptic number.

21265222276 is the 145826-th square number.

It is an amenable number.

21265222276 is a deficient number, since it is larger than the sum of its proper divisors (18275971563).

21265222276 is an frugal number, since it uses more digits than its factorization.

21265222276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8616 (or 4308 counting only the distinct ones).

The product of its digits is 80640, while the sum is 37.

Adding to 21265222276 its reverse (67222256212), we get a palindrome (88487478488).

The spelling of 21265222276 in words is "twenty-one billion, two hundred sixty-five million, two hundred twenty-two thousand, two hundred seventy-six".