12721900 has 18 divisors (see below), whose sum is σ = 27606740. Its totient is φ = 5088720.

The previous prime is 12721847. The next prime is 12721903. The reversal of 12721900 is 912721.

12721900 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×12721900³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (12721903) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 63510 + ... + 63709.

Almost surely, 2^12721900 is an apocalyptic number.

12721900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12721900 is an abundant number, since it is smaller than the sum of its proper divisors (14884840).

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

12721900 is a wasteful number, since it uses less digits than its factorization.

12721900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127233 (or 127226 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 12721900 is about 3566.7772568525. Note that the first 3 decimals coincide. The cubic root of 12721900 is about 233.4446860801. Note that the first 3 decimals are identical.

The spelling of 12721900 in words is "twelve million, seven hundred twenty-one thousand, nine hundred".