12902921 has 4 divisors (see below), whose sum is σ = 12980352. Its totient is φ = 12825492.

The previous prime is 12902891. The next prime is 12902951. The reversal of 12902921 is 12920921.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (12902891) and next prime (12902951).

It is a cyclic number.

It is not a de Polignac number, because 12902921 - 2²² = 8708617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12902951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38465 + ... + 38798.

It is an arithmetic number, because the mean of its divisors is an integer number (3245088).

Almost surely, 2^12902921 is an apocalyptic number.

It is an amenable number.

12902921 is a deficient number, since it is larger than the sum of its proper divisors (77431).

12902921 is an equidigital number, since it uses as much as digits as its factorization.

12902921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77430.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 12902921 is about 3592.0636130225. The cubic root of 12902921 is about 234.5467103408.

The spelling of 12902921 in words is "twelve million, nine hundred two thousand, nine hundred twenty-one".