21621772267116 has 48 divisors (see below), whose sum is σ = 60164931531264. Its totient is φ = 5909055774336.

The previous prime is 21621772267061. The next prime is 21621772267129. The reversal of 21621772267116 is 61176227712612.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5595694825 + ... + 5595698688.

It is an arithmetic number, because the mean of its divisors is an integer number (1253436073568).

Almost surely, 2^{21621772267116} is an apocalyptic number.

It is an amenable number.

21621772267116 is an abundant number, since it is smaller than the sum of its proper divisors (38543159264148).

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

21621772267116 is a wasteful number, since it uses less digits than its factorization.

21621772267116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11191393550 (or 11191393548 counting only the distinct ones).

The product of its digits is 1185408, while the sum is 51.

Adding to 21621772267116 its reverse (61176227712612), we get a palindrome (82797999979728).

The spelling of 21621772267116 in words is "twenty-one trillion, six hundred twenty-one billion, seven hundred seventy-two million, two hundred sixty-seven thousand, one hundred sixteen".