13981043021 has 4 divisors (see below), whose sum is σ = 15252046944. Its totient is φ = 12710039100.

The previous prime is 13981043003. The next prime is 13981043053. The reversal of 13981043021 is 12034018931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 13981043021 - 2¹⁴ = 13981026637 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 (13981046021) 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, 635501945 + ... + 635501966.

It is an arithmetic number, because the mean of its divisors is an integer number (3813011736).

Almost surely, 2^13981043021 is an apocalyptic number.

13981043021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13981043021 is a deficient number, since it is larger than the sum of its proper divisors (1271003923).

13981043021 is a wasteful number, since it uses less digits than its factorization.

13981043021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1271003922.

The product of its (nonzero) digits is 5184, while the sum is 32.

The spelling of 13981043021 in words is "thirteen billion, nine hundred eighty-one million, forty-three thousand, twenty-one".