113987201821 has 4 divisors (see below), whose sum is σ = 114115711392. Its totient is φ = 113858692252.

The previous prime is 113987201807. The next prime is 113987201849. The reversal of 113987201821 is 128102789311.

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 a cyclic number.

It is not a de Polignac number, because 113987201821 - 2¹⁷ = 113987070749 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 (113987201021) 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, 64253455 + ... + 64255228.

It is an arithmetic number, because the mean of its divisors is an integer number (28528927848).

Almost surely, 2^113987201821 is an apocalyptic number.

It is an amenable number.

113987201821 is a deficient number, since it is larger than the sum of its proper divisors (128509571).

113987201821 is an equidigital number, since it uses as much as digits as its factorization.

113987201821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128509570.

The product of its (nonzero) digits is 48384, while the sum is 43.

The spelling of 113987201821 in words is "one hundred thirteen billion, nine hundred eighty-seven million, two hundred one thousand, eight hundred twenty-one".