13721522 has 8 divisors (see below), whose sum is σ = 20604396. Its totient is φ = 6853392.

The previous prime is 13721497. The next prime is 13721527. The reversal of 13721522 is 22512731.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8708401 + 5013121 = 2951^2 + 2239^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (13721527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 953 + ... + 5324.

Almost surely, 2^13721522 is an apocalyptic number.

13721522 is a deficient number, since it is larger than the sum of its proper divisors (6882874).

13721522 is a wasteful number, since it uses less digits than its factorization.

13721522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7372.

The product of its digits is 840, while the sum is 23.

The square root of 13721522 is about 3704.2572804815. The cubic root of 13721522 is about 239.4054845319.

The spelling of 13721522 in words is "thirteen million, seven hundred twenty-one thousand, five hundred twenty-two".