13610721 has 16 divisors (see below), whose sum is σ = 18532800. Its totient is φ = 8883648.

The previous prime is 13610719. The next prime is 13610731. The reversal of 13610721 is 12701631.

It is not a de Polignac number, because 13610721 - 2¹ = 13610719 is a prime.

It is a super-2 number, since 2×13610721² = 370503452279682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13610731) 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, 34795 + ... + 35183.

It is an arithmetic number, because the mean of its divisors is an integer number (1158300).

Almost surely, 2^13610721 is an apocalyptic number.

It is an amenable number.

13610721 is a deficient number, since it is larger than the sum of its proper divisors (4922079).

13610721 is a wasteful number, since it uses less digits than its factorization.

13610721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 13610721 is about 3689.2710662135. The cubic root of 13610721 is about 238.7593441332.

The spelling of 13610721 in words is "thirteen million, six hundred ten thousand, seven hundred twenty-one".