158403936221 has 2 divisors, whose sum is σ = 158403936222. Its totient is φ = 158403936220.

The previous prime is 158403936193. The next prime is 158403936247. The reversal of 158403936221 is 122639304851.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 145946920900 + 12457015321 = 382030^2 + 111611^2 .

It is a cyclic number.

It is not a de Polignac number, because 158403936221 - 2¹⁴ = 158403919837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158403932221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79201968110 + 79201968111.

It is an arithmetic number, because the mean of its divisors is an integer number (79201968111).

Almost surely, 2^158403936221 is an apocalyptic number.

It is an amenable number.

158403936221 is a deficient number, since it is larger than the sum of its proper divisors (1).

158403936221 is an equidigital number, since it uses as much as digits as its factorization.

158403936221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 311040, while the sum is 44.

The spelling of 158403936221 in words is "one hundred fifty-eight billion, four hundred three million, nine hundred thirty-six thousand, two hundred twenty-one".