157021211972 has 6 divisors (see below), whose sum is σ = 274787120958. Its totient is φ = 78510605984.

The previous prime is 157021211959. The next prime is 157021212001. The reversal of 157021211972 is 279112120751.

It can be written as a sum of positive squares in only one way, i.e., 156589569796 + 431642176 = 395714^2 + 20776^2 .

It is a super-2 number, since 2×157021211972² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19627651493 + ... + 19627651500.

It is an arithmetic number, because the mean of its divisors is an integer number (45797853493).

Almost surely, 2^157021211972 is an apocalyptic number.

It is an amenable number.

157021211972 is a deficient number, since it is larger than the sum of its proper divisors (117765908986).

157021211972 is a wasteful number, since it uses less digits than its factorization.

157021211972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39255302997 (or 39255302995 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 38.

The spelling of 157021211972 in words is "one hundred fifty-seven billion, twenty-one million, two hundred eleven thousand, nine hundred seventy-two".