213157726690 has 16 divisors (see below), whose sum is σ = 384595278840. Its totient is φ = 85060563840.

The previous prime is 213157726687. The next prime is 213157726697. The reversal of 213157726690 is 96627751312.

It can be written as a sum of positive squares in 4 ways, for example, as 159629814369 + 53527912321 = 399537^2 + 231361^2 .

It is a super-2 number, since 2×213157726690² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (213157726697) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25311435 + ... + 25319854.

Almost surely, 2^213157726690 is an apocalyptic number.

213157726690 is a deficient number, since it is larger than the sum of its proper divisors (171437552150).

213157726690 is a wasteful number, since it uses less digits than its factorization.

213157726690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50631717.

The product of its (nonzero) digits is 952560, while the sum is 49.

The spelling of 213157726690 in words is "two hundred thirteen billion, one hundred fifty-seven million, seven hundred twenty-six thousand, six hundred ninety".