12992121 has 24 divisors (see below), whose sum is σ = 19439784. Its totient is φ = 8355840.

The previous prime is 12992101. The next prime is 12992123. The reversal of 12992121 is 12129921.

It can be written as a sum of positive squares in 4 ways, for example, as 2822400 + 10169721 = 1680^2 + 3189^2 .

It is not a de Polignac number, because 12992121 - 2⁹ = 12991609 is a prime.

12992121 is a Rhonda number in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12992123) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50425 + ... + 50681.

It is an arithmetic number, because the mean of its divisors is an integer number (809991).

Almost surely, 2^12992121 is an apocalyptic number.

It is an amenable number.

12992121 is a deficient number, since it is larger than the sum of its proper divisors (6447663).

12992121 is a wasteful number, since it uses less digits than its factorization.

12992121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441 (or 438 counting only the distinct ones).

The product of its digits is 648, while the sum is 27.

The square root of 12992121 is about 3604.4584891492. The cubic root of 12992121 is about 235.0859561823.

The spelling of 12992121 in words is "twelve million, nine hundred ninety-two thousand, one hundred twenty-one".