21862013197 has 4 divisors (see below), whose sum is σ = 21862743840. Its totient is φ = 21861282556.

The previous prime is 21862013191. The next prime is 21862013213. The reversal of 21862013197 is 79131026812.

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 21862013197 - 2¹⁵ = 21861980429 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 (21862013191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 318433 + ... + 380950.

It is an arithmetic number, because the mean of its divisors is an integer number (5465685960).

Almost surely, 2^21862013197 is an apocalyptic number.

It is an amenable number.

21862013197 is a deficient number, since it is larger than the sum of its proper divisors (730643).

21862013197 is an equidigital number, since it uses as much as digits as its factorization.

21862013197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730642.

The product of its (nonzero) digits is 36288, while the sum is 40.

The spelling of 21862013197 in words is "twenty-one billion, eight hundred sixty-two million, thirteen thousand, one hundred ninety-seven".