12721440100 has 18 divisors (see below), whose sum is σ = 27605525234. Its totient is φ = 5088576000.

The previous prime is 12721440079. The next prime is 12721440103. The reversal of 12721440100 is 104412721.

It can be written as a sum of positive squares in 3 ways, for example, as 1945339236 + 10776100864 = 44106^2 + 103808^2 .

It is not an unprimeable number, because it can be changed into a prime (12721440103) 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, 63607101 + ... + 63607300.

Almost surely, 2^12721440100 is an apocalyptic number.

12721440100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12721440100 is an abundant number, since it is smaller than the sum of its proper divisors (14884085134).

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

12721440100 is a wasteful number, since it uses less digits than its factorization.

12721440100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127214415 (or 127214408 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 22.

Adding to 12721440100 its reverse (104412721), we get a palindrome (12825852821).

The spelling of 12721440100 in words is "twelve billion, seven hundred twenty-one million, four hundred forty thousand, one hundred".