12900921 has 16 divisors (see below), whose sum is σ = 18840000. Its totient is φ = 7787520.

The previous prime is 12900887. The next prime is 12900931.

12900921 is nontrivially palindromic in base 10.

12900921 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12900921 - 2⁶ = 12900857 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12900891 and 12900900.

It is not an unprimeable number, because it can be changed into a prime (12900931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9705 + ... + 10953.

It is an arithmetic number, because the mean of its divisors is an integer number (1177500).

Almost surely, 2^12900921 is an apocalyptic number.

12900921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12900921 is a deficient number, since it is larger than the sum of its proper divisors (5939079).

12900921 is a wasteful number, since it uses less digits than its factorization.

12900921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1576.

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 12900921 is about 3591.7852107274. The cubic root of 12900921 is about 234.5345911817.

The spelling of 12900921 in words is "twelve million, nine hundred thousand, nine hundred twenty-one".