13910450021 has 4 divisors (see below), whose sum is σ = 14980484652. Its totient is φ = 12840415392.

The previous prime is 13910450017. The next prime is 13910450053. The reversal of 13910450021 is 12005401931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8117109025 + 5793340996 = 90095^2 + 76114^2 .

It is a cyclic number.

It is not a de Polignac number, because 13910450021 - 2² = 13910450017 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 (13910450011) 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, 535017296 + ... + 535017321.

It is an arithmetic number, because the mean of its divisors is an integer number (3745121163).

Almost surely, 2^13910450021 is an apocalyptic number.

It is an amenable number.

13910450021 is a deficient number, since it is larger than the sum of its proper divisors (1070034631).

13910450021 is a wasteful number, since it uses less digits than its factorization.

13910450021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1070034630.

The product of its (nonzero) digits is 1080, while the sum is 26.

Adding to 13910450021 its reverse (12005401931), we get a palindrome (25915851952).

The spelling of 13910450021 in words is "thirteen billion, nine hundred ten million, four hundred fifty thousand, twenty-one".