12721419 has 12 divisors (see below), whose sum is σ = 18509400. Its totient is φ = 8419104.

The previous prime is 12721417. The next prime is 12721441. The reversal of 12721419 is 91412721.

It is not a de Polignac number, because 12721419 - 2¹ = 12721417 is a prime.

It is a super-2 number, since 2×12721419² = 323669002747122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12721392 and 12721401.

It is not an unprimeable number, because it can be changed into a prime (12721411) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3834 + ... + 6335.

It is an arithmetic number, because the mean of its divisors is an integer number (1542450).

Almost surely, 2^12721419 is an apocalyptic number.

12721419 is a deficient number, since it is larger than the sum of its proper divisors (5787981).

12721419 is a wasteful number, since it uses less digits than its factorization.

12721419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10314 (or 10311 counting only the distinct ones).

The product of its digits is 1008, while the sum is 27.

The square root of 12721419 is about 3566.7098283993. The cubic root of 12721419 is about 233.4417439539.

The spelling of 12721419 in words is "twelve million, seven hundred twenty-one thousand, four hundred nineteen".