14039971621 has 4 divisors (see below), whose sum is σ = 15119969452. Its totient is φ = 12959973792.

The previous prime is 14039971597. The next prime is 14039971633. The reversal of 14039971621 is 12617993041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12617993041 = 101173 ⋅124717.

It can be written as a sum of positive squares in 2 ways, for example, as 927202500 + 13112769121 = 30450^2 + 114511^2 .

It is a cyclic number.

It is not a de Polignac number, because 14039971621 - 2²⁷ = 13905753893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (14039972621) 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, 539998896 + ... + 539998921.

It is an arithmetic number, because the mean of its divisors is an integer number (3779992363).

Almost surely, 2^14039971621 is an apocalyptic number.

It is an amenable number.

14039971621 is a deficient number, since it is larger than the sum of its proper divisors (1079997831).

14039971621 is a wasteful number, since it uses less digits than its factorization.

14039971621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079997830.

The product of its (nonzero) digits is 81648, while the sum is 43.

The spelling of 14039971621 in words is "fourteen billion, thirty-nine million, nine hundred seventy-one thousand, six hundred twenty-one".