156214745221 has 2 divisors, whose sum is σ = 156214745222. Its totient is φ = 156214745220.

The previous prime is 156214745207. The next prime is 156214745231. The reversal of 156214745221 is 122547412651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111298300996 + 44916444225 = 333614^2 + 211935^2 .

It is a cyclic number.

It is not a de Polignac number, because 156214745221 - 2¹⁵ = 156214712453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156214745231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78107372610 + 78107372611.

It is an arithmetic number, because the mean of its divisors is an integer number (78107372611).

Almost surely, 2^156214745221 is an apocalyptic number.

It is an amenable number.

156214745221 is a deficient number, since it is larger than the sum of its proper divisors (1).

156214745221 is an equidigital number, since it uses as much as digits as its factorization.

156214745221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 134400, while the sum is 40.

The spelling of 156214745221 in words is "one hundred fifty-six billion, two hundred fourteen million, seven hundred forty-five thousand, two hundred twenty-one".