186372219421 has 2 divisors, whose sum is σ = 186372219422. Its totient is φ = 186372219420.

The previous prime is 186372219391. The next prime is 186372219491. The reversal of 186372219421 is 124912273681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141067096921 + 45305122500 = 375589^2 + 212850^2 .

It is a cyclic number.

It is not a de Polignac number, because 186372219421 - 2⁵ = 186372219389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (186372219491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93186109710 + 93186109711.

It is an arithmetic number, because the mean of its divisors is an integer number (93186109711).

Almost surely, 2^186372219421 is an apocalyptic number.

It is an amenable number.

186372219421 is a deficient number, since it is larger than the sum of its proper divisors (1).

186372219421 is an equidigital number, since it uses as much as digits as its factorization.

186372219421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 46.

The spelling of 186372219421 in words is "one hundred eighty-six billion, three hundred seventy-two million, two hundred nineteen thousand, four hundred twenty-one".