157620072021 has 4 divisors (see below), whose sum is σ = 210160096032. Its totient is φ = 105080048012.

The previous prime is 157620072017. The next prime is 157620072131. The reversal of 157620072021 is 120270026751.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 157620072021 - 2² = 157620072017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157620072011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26270012001 + ... + 26270012006.

It is an arithmetic number, because the mean of its divisors is an integer number (52540024008).

Almost surely, 2^157620072021 is an apocalyptic number.

It is an amenable number.

157620072021 is a deficient number, since it is larger than the sum of its proper divisors (52540024011).

157620072021 is an equidigital number, since it uses as much as digits as its factorization.

157620072021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52540024010.

The product of its (nonzero) digits is 11760, while the sum is 33.

Adding to 157620072021 its reverse (120270026751), we get a palindrome (277890098772).

The spelling of 157620072021 in words is "one hundred fifty-seven billion, six hundred twenty million, seventy-two thousand, twenty-one".