157221133 has 2 divisors, whose sum is σ = 157221134. Its totient is φ = 157221132.

The previous prime is 157221121. The next prime is 157221149. The reversal of 157221133 is 331122751.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138368169 + 18852964 = 11763^2 + 4342^2 .

It is a cyclic number.

It is not a de Polignac number, because 157221133 - 2⁹ = 157220621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 157221098 and 157221107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157221733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78610566 + 78610567.

It is an arithmetic number, because the mean of its divisors is an integer number (78610567).

Almost surely, 2^157221133 is an apocalyptic number.

It is an amenable number.

157221133 is a deficient number, since it is larger than the sum of its proper divisors (1).

157221133 is an equidigital number, since it uses as much as digits as its factorization.

157221133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1260, while the sum is 25.

The square root of 157221133 is about 12538.7851484903. The cubic root of 157221133 is about 539.7222314011.

Adding to 157221133 its reverse (331122751), we get a palindrome (488343884).

The spelling of 157221133 in words is "one hundred fifty-seven million, two hundred twenty-one thousand, one hundred thirty-three".