13721019 has 16 divisors (see below), whose sum is σ = 20184864. Its totient is φ = 8236800.

The previous prime is 13720933. The next prime is 13721033. The reversal of 13721019 is 91012731.

It is not a de Polignac number, because 13721019 - 2⁷ = 13720891 is a prime.

It is a super-2 number, since 2×13721019² = 376532724796722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13721019.

It is not an unprimeable number, because it can be changed into a prime (13721419) 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, 2692 + ... + 5889.

It is an arithmetic number, because the mean of its divisors is an integer number (1261554).

Almost surely, 2^13721019 is an apocalyptic number.

13721019 is a deficient number, since it is larger than the sum of its proper divisors (6463845).

13721019 is a wasteful number, since it uses less digits than its factorization.

13721019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8638.

The product of its (nonzero) digits is 378, while the sum is 24.

The square root of 13721019 is about 3704.1893850072. The cubic root of 13721019 is about 239.4025591414.

The spelling of 13721019 in words is "thirteen million, seven hundred twenty-one thousand, nineteen".