13886029921 has 3 divisors (see below), whose sum is σ = 13886147761. Its totient is φ = 13885912082.

The previous prime is 13886029909. The next prime is 13886029931. The reversal of 13886029921 is 12992068831.

The square root of 13886029921 is 117839.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a de Polignac number, because none of the positive numbers 2^k-13886029921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13886029931) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 58920 + ... + 176758.

Almost surely, 2^13886029921 is an apocalyptic number.

13886029921 is the 117839-th square number.

13886029921 is the 58920-th centered octagonal number.

It is an amenable number.

13886029921 is a deficient number, since it is larger than the sum of its proper divisors (117840).

13886029921 is an frugal number, since it uses more digits than its factorization.

13886029921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235678 (or 117839 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 49.

Multiplying 13886029921 by its sum of digits (49), we get a square (680415466129 = 824873²).

The spelling of 13886029921 in words is "thirteen billion, eight hundred eighty-six million, twenty-nine thousand, nine hundred twenty-one".