21096400516 has 9 divisors (see below), whose sum is σ = 36919209271. Its totient is φ = 10548055012.

The previous prime is 21096400499. The next prime is 21096400543. The reversal of 21096400516 is 61500469012.

The square root of 21096400516 is 145246.

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

It is a super-2 number, since 2×21096400516² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 254181 + ... + 326803.

Almost surely, 2^21096400516 is an apocalyptic number.

21096400516 is the 145246-th square number.

It is an amenable number.

21096400516 is a deficient number, since it is larger than the sum of its proper divisors (15822808755).

21096400516 is an frugal number, since it uses more digits than its factorization.

21096400516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145250 (or 72625 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

Adding to 21096400516 its reverse (61500469012), we get a palindrome (82596869528).

The spelling of 21096400516 in words is "twenty-one billion, ninety-six million, four hundred thousand, five hundred sixteen".