188700000421 has 2 divisors, whose sum is σ = 188700000422. Its totient is φ = 188700000420.

The previous prime is 188700000361. The next prime is 188700000457. The reversal of 188700000421 is 124000007881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181229855521 + 7470144900 = 425711^2 + 86430^2 .

It is a cyclic number.

It is not a de Polignac number, because 188700000421 - 2²³ = 188691611813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (188700003421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94350000210 + 94350000211.

It is an arithmetic number, because the mean of its divisors is an integer number (94350000211).

Almost surely, 2^188700000421 is an apocalyptic number.

It is an amenable number.

188700000421 is a deficient number, since it is larger than the sum of its proper divisors (1).

188700000421 is an equidigital number, since it uses as much as digits as its factorization.

188700000421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3584, while the sum is 31.

The spelling of 188700000421 in words is "one hundred eighty-eight billion, seven hundred million, four hundred twenty-one", and thus it is an aban number.