213939024699781 has 2 divisors, whose sum is σ = 213939024699782. Its totient is φ = 213939024699780.

The previous prime is 213939024699769. The next prime is 213939024699793. The reversal of 213939024699781 is 187996420939312.

It is a balanced prime because it is at equal distance from previous prime (213939024699769) and next prime (213939024699793).

It can be written as a sum of positive squares in only one way, i.e., 131705576453025 + 82233448246756 = 11476305^2 + 9068266^2 .

It is a cyclic number.

It is not a de Polignac number, because 213939024699781 - 2⁵ = 213939024699749 is a prime.

It is a super-2 number, since 2×213939024699781² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213939024699731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106969512349890 + 106969512349891.

It is an arithmetic number, because the mean of its divisors is an integer number (106969512349891).

Almost surely, 2^{213939024699781} is an apocalyptic number.

It is an amenable number.

213939024699781 is a deficient number, since it is larger than the sum of its proper divisors (1).

213939024699781 is an equidigital number, since it uses as much as digits as its factorization.

213939024699781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 317447424, while the sum is 73.

The spelling of 213939024699781 in words is "two hundred thirteen trillion, nine hundred thirty-nine billion, twenty-four million, six hundred ninety-nine thousand, seven hundred eighty-one".