213033737681 has 2 divisors, whose sum is σ = 213033737682. Its totient is φ = 213033737680.

The previous prime is 213033737641. The next prime is 213033737701. The reversal of 213033737681 is 186737330312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190318425025 + 22715312656 = 436255^2 + 150716^2 .

It is a cyclic number.

It is not a de Polignac number, because 213033737681 - 2²⁶ = 212966628817 is a prime.

It is a super-2 number, since 2×213033737681² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (213033737611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106516868840 + 106516868841.

It is an arithmetic number, because the mean of its divisors is an integer number (106516868841).

Almost surely, 2^213033737681 is an apocalyptic number.

It is an amenable number.

213033737681 is a deficient number, since it is larger than the sum of its proper divisors (1).

213033737681 is an equidigital number, since it uses as much as digits as its factorization.

213033737681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 381024, while the sum is 44.

The spelling of 213033737681 in words is "two hundred thirteen billion, thirty-three million, seven hundred thirty-seven thousand, six hundred eighty-one".