12921900 has 72 divisors (see below), whose sum is σ = 39372480. Its totient is φ = 3263040.

The previous prime is 12921893. The next prime is 12921901. The reversal of 12921900 is 912921.

12921900 = T₃₃₄ + T₃₃₅ + ... + T₄₈₅.

It is a super-2 number, since 2×12921900² = 333950999220000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12921901) 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, 4567 + ... + 6833.

It is an arithmetic number, because the mean of its divisors is an integer number (546840).

Almost surely, 2^12921900 is an apocalyptic number.

12921900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12921900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19686240).

12921900 is an abundant number, since it is smaller than the sum of its proper divisors (26450580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12921900 is a wasteful number, since it uses less digits than its factorization.

12921900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2303 (or 2296 counting only the distinct ones).

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

The square root of 12921900 is about 3594.7044384761. The cubic root of 12921900 is about 234.6616528213.

The spelling of 12921900 in words is "twelve million, nine hundred twenty-one thousand, nine hundred".