213012420161 has 2 divisors, whose sum is σ = 213012420162. Its totient is φ = 213012420160.

The previous prime is 213012420157. The next prime is 213012420241. The reversal of 213012420161 is 161024210312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123503747761 + 89508672400 = 351431^2 + 299180^2 .

It is a cyclic number.

It is not a de Polignac number, because 213012420161 - 2² = 213012420157 is a prime.

It is a super-2 number, since 2×213012420161² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (213012420461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106506210080 + 106506210081.

It is an arithmetic number, because the mean of its divisors is an integer number (106506210081).

Almost surely, 2^213012420161 is an apocalyptic number.

It is an amenable number.

213012420161 is a deficient number, since it is larger than the sum of its proper divisors (1).

213012420161 is an equidigital number, since it uses as much as digits as its factorization.

213012420161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 213012420161 its reverse (161024210312), we get a palindrome (374036630473).

The spelling of 213012420161 in words is "two hundred thirteen billion, twelve million, four hundred twenty thousand, one hundred sixty-one".