213591390681 has 8 divisors (see below), whose sum is σ = 285816639424. Its totient is φ = 141880201200.

The previous prime is 213591390587. The next prime is 213591390697. The reversal of 213591390681 is 186093195312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 213591390681 - 2²² = 213587196377 is a prime.

It is a super-2 number, since 2×213591390681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213591390681.

It is not an unprimeable number, because it can be changed into a prime (213591390281) 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, 128513845 + ... + 128515506.

It is an arithmetic number, because the mean of its divisors is an integer number (35727079928).

Almost surely, 2^213591390681 is an apocalyptic number.

It is an amenable number.

213591390681 is a deficient number, since it is larger than the sum of its proper divisors (72225248743).

213591390681 is a wasteful number, since it uses less digits than its factorization.

213591390681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257029631.

The product of its (nonzero) digits is 349920, while the sum is 48.

It can be divided in two parts, 21359 and 1390681, that added together give a triangular number (1412040 = T₁₆₈₀).

The spelling of 213591390681 in words is "two hundred thirteen billion, five hundred ninety-one million, three hundred ninety thousand, six hundred eighty-one".