213121313021077 has 2 divisors, whose sum is σ = 213121313021078. Its totient is φ = 213121313021076.

The previous prime is 213121313021047. The next prime is 213121313021117. The reversal of 213121313021077 is 770120313121312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108075027895396 + 105046285125681 = 10395914^2 + 10249209^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213121313021077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213121313021047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106560656510538 + 106560656510539.

It is an arithmetic number, because the mean of its divisors is an integer number (106560656510539).

Almost surely, 2^{213121313021077} is an apocalyptic number.

It is an amenable number.

213121313021077 is a deficient number, since it is larger than the sum of its proper divisors (1).

213121313021077 is an equidigital number, since it uses as much as digits as its factorization.

213121313021077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10584, while the sum is 34.

Adding to 213121313021077 its reverse (770120313121312), we get a palindrome (983241626142389).

The spelling of 213121313021077 in words is "two hundred thirteen trillion, one hundred twenty-one billion, three hundred thirteen million, twenty-one thousand, seventy-seven".