213929927381 has 2 divisors, whose sum is σ = 213929927382. Its totient is φ = 213929927380.

The previous prime is 213929927353. The next prime is 213929927383. The reversal of 213929927381 is 183729929312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206020671025 + 7909256356 = 453895^2 + 88934^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213929927381 is a prime.

It is a super-2 number, since 2×213929927381² (a number of 23 digits) contains 22 as substring.

Together with 213929927383, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213929927383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106964963690 + 106964963691.

It is an arithmetic number, because the mean of its divisors is an integer number (106964963691).

Almost surely, 2^213929927381 is an apocalyptic number.

It is an amenable number.

213929927381 is a deficient number, since it is larger than the sum of its proper divisors (1).

213929927381 is an equidigital number, since it uses as much as digits as its factorization.

213929927381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2939328, while the sum is 56.

The spelling of 213929927381 in words is "two hundred thirteen billion, nine hundred twenty-nine million, nine hundred twenty-seven thousand, three hundred eighty-one".