13996358021 has 4 divisors (see below), whose sum is σ = 13996651500. Its totient is φ = 13996064544.

The previous prime is 13996358017. The next prime is 13996358029. The reversal of 13996358021 is 12085369931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12085369931 = 271 ⋅44595461.

It can be written as a sum of positive squares in 2 ways, for example, as 7887216100 + 6109141921 = 88810^2 + 78161^2 .

It is a cyclic number.

It is not a de Polignac number, because 13996358021 - 2² = 13996358017 is a prime.

It is a super-2 number, since 2×13996358021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13996358029) 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, 56846 + ... + 176703.

It is an arithmetic number, because the mean of its divisors is an integer number (3499162875).

Almost surely, 2^13996358021 is an apocalyptic number.

It is an amenable number.

13996358021 is a deficient number, since it is larger than the sum of its proper divisors (293479).

13996358021 is an equidigital number, since it uses as much as digits as its factorization.

13996358021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293478.

The product of its (nonzero) digits is 349920, while the sum is 47.

The spelling of 13996358021 in words is "thirteen billion, nine hundred ninety-six million, three hundred fifty-eight thousand, twenty-one".