213850121677 has 2 divisors, whose sum is σ = 213850121678. Its totient is φ = 213850121676.

The previous prime is 213850121669. The next prime is 213850121699. The reversal of 213850121677 is 776121058312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 207959712676 + 5890409001 = 456026^2 + 76749^2 .

It is a cyclic number.

It is not a de Polignac number, because 213850121677 - 2³ = 213850121669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213850121627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106925060838 + 106925060839.

It is an arithmetic number, because the mean of its divisors is an integer number (106925060839).

Almost surely, 2^213850121677 is an apocalyptic number.

It is an amenable number.

213850121677 is a deficient number, since it is larger than the sum of its proper divisors (1).

213850121677 is an equidigital number, since it uses as much as digits as its factorization.

213850121677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 141120, while the sum is 43.

Adding to 213850121677 its reverse (776121058312), we get a palindrome (989971179989).

The spelling of 213850121677 in words is "two hundred thirteen billion, eight hundred fifty million, one hundred twenty-one thousand, six hundred seventy-seven".