157221943 has 2 divisors, whose sum is σ = 157221944. Its totient is φ = 157221942.

The previous prime is 157221931. The next prime is 157221989. The reversal of 157221943 is 349122751.

It is a happy number.

157221943 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (349122751) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 157221943 - 2⁹ = 157221431 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 157221899 and 157221908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157221923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78610971 + 78610972.

It is an arithmetic number, because the mean of its divisors is an integer number (78610972).

Almost surely, 2^157221943 is an apocalyptic number.

157221943 is a deficient number, since it is larger than the sum of its proper divisors (1).

157221943 is an equidigital number, since it uses as much as digits as its factorization.

157221943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 34.

The square root of 157221943 is about 12538.8174482285. The cubic root of 157221943 is about 539.7231582787.

The spelling of 157221943 in words is "one hundred fifty-seven million, two hundred twenty-one thousand, nine hundred forty-three".