12229926921 has 27 divisors (see below), whose sum is σ = 17850912807. Its totient is φ = 8068573440.

The previous prime is 12229926889. The next prime is 12229926931. The reversal of 12229926921 is 12962992221.

It is a happy number.

The square root of 12229926921 is 110589.

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., 2963169225 + 9266757696 = 54435^2 + 96264^2 .

It is not a de Polignac number, because 12229926921 - 2⁵ = 12229926889 is a prime.

It is a super-2 number, since 2×12229926921² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12229926931) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 63367401 + ... + 63367593.

Almost surely, 2^12229926921 is an apocalyptic number.

12229926921 is the 110589-th square number.

12229926921 is the 55295-th centered octagonal number.

It is an amenable number.

12229926921 is a deficient number, since it is larger than the sum of its proper divisors (5620985886).

12229926921 is an frugal number, since it uses more digits than its factorization.

12229926921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774 (or 387 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The spelling of 12229926921 in words is "twelve billion, two hundred twenty-nine million, nine hundred twenty-six thousand, nine hundred twenty-one".