13972021 has 16 divisors (see below), whose sum is σ = 16571520. Its totient is φ = 11531520.

The previous prime is 13972009. The next prime is 13972027. The reversal of 13972021 is 12027931.

13972021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13972021 - 2¹¹ = 13969973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13972027) 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, 25270 + ... + 25816.

It is an arithmetic number, because the mean of its divisors is an integer number (1035720).

Almost surely, 2^13972021 is an apocalyptic number.

It is an amenable number.

13972021 is a deficient number, since it is larger than the sum of its proper divisors (2599499).

13972021 is an equidigital number, since it uses as much as digits as its factorization.

13972021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 13972021 is about 3737.9166657377. The cubic root of 13972021 is about 240.8535636980.

Adding to 13972021 its reverse (12027931), we get a palindrome (25999952).

The spelling of 13972021 in words is "thirteen million, nine hundred seventy-two thousand, twenty-one".