213920684531 has 2 divisors, whose sum is σ = 213920684532. Its totient is φ = 213920684530.

The previous prime is 213920684507. The next prime is 213920684603. The reversal of 213920684531 is 135486029312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213920684531 - 2¹⁰ = 213920683507 is a prime.

It is a super-2 number, since 2×213920684531² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (213920684501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106960342265 + 106960342266.

It is an arithmetic number, because the mean of its divisors is an integer number (106960342266).

Almost surely, 2^213920684531 is an apocalyptic number.

213920684531 is a deficient number, since it is larger than the sum of its proper divisors (1).

213920684531 is an equidigital number, since it uses as much as digits as its factorization.

213920684531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 311040, while the sum is 44.

The spelling of 213920684531 in words is "two hundred thirteen billion, nine hundred twenty million, six hundred eighty-four thousand, five hundred thirty-one".