157381740421 has 2 divisors, whose sum is σ = 157381740422. Its totient is φ = 157381740420.

The previous prime is 157381740419. The next prime is 157381740427. The reversal of 157381740421 is 124047183751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 151702460100 + 5679280321 = 389490^2 + 75361^2 .

It is an emirp because it is prime and its reverse (124047183751) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 157381740421 - 2¹ = 157381740419 is a prime.

Together with 157381740419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157381740427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78690870210 + 78690870211.

It is an arithmetic number, because the mean of its divisors is an integer number (78690870211).

Almost surely, 2^157381740421 is an apocalyptic number.

It is an amenable number.

157381740421 is a deficient number, since it is larger than the sum of its proper divisors (1).

157381740421 is an equidigital number, since it uses as much as digits as its factorization.

157381740421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 188160, while the sum is 43.

The spelling of 157381740421 in words is "one hundred fifty-seven billion, three hundred eighty-one million, seven hundred forty thousand, four hundred twenty-one".