213662020961 has 2 divisors, whose sum is σ = 213662020962. Its totient is φ = 213662020960.

The previous prime is 213662020931. The next prime is 213662020973. The reversal of 213662020961 is 169020266312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134574520336 + 79087500625 = 366844^2 + 281225^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213662020961 is a prime.

It is a super-2 number, since 2×213662020961² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (213662020931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106831010480 + 106831010481.

It is an arithmetic number, because the mean of its divisors is an integer number (106831010481).

Almost surely, 2^213662020961 is an apocalyptic number.

It is an amenable number.

213662020961 is a deficient number, since it is larger than the sum of its proper divisors (1).

213662020961 is an equidigital number, since it uses as much as digits as its factorization.

213662020961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 38.

The spelling of 213662020961 in words is "two hundred thirteen billion, six hundred sixty-two million, twenty thousand, nine hundred sixty-one".