157402392012121 has 3 divisors (see below), whose sum is σ = 157402404558133. Its totient is φ = 157402379466110.

The previous prime is 157402392012109. The next prime is 157402392012137. The reversal of 157402392012121 is 121210293204751.

The square root of 157402392012121 is 12546011.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 157402392012121 - 2²¹ = 157402389914969 is a prime.

It is a super-2 number, since 2×157402392012121² (a number of 29 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157402392012181) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 6273006 + ... + 18819016.

Almost surely, 2^{157402392012121} is an apocalyptic number.

157402392012121 is the 12546011-st square number.

157402392012121 is the 6273006-th centered octagonal number.

It is an amenable number.

157402392012121 is a deficient number, since it is larger than the sum of its proper divisors (12546012).

157402392012121 is an frugal number, since it uses more digits than its factorization.

157402392012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25092022 (or 12546011 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 157402392012121 in words is "one hundred fifty-seven trillion, four hundred two billion, three hundred ninety-two million, twelve thousand, one hundred twenty-one".