213373877281 has 2 divisors, whose sum is σ = 213373877282. Its totient is φ = 213373877280.

The previous prime is 213373877243. The next prime is 213373877291. The reversal of 213373877281 is 182778373312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155716262881 + 57657614400 = 394609^2 + 240120^2 .

It is a cyclic number.

It is not a de Polignac number, because 213373877281 - 2³¹ = 211226393633 is a prime.

It is a super-2 number, since 2×213373877281² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (213373877291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106686938640 + 106686938641.

It is an arithmetic number, because the mean of its divisors is an integer number (106686938641).

Almost surely, 2^213373877281 is an apocalyptic number.

It is an amenable number.

213373877281 is a deficient number, since it is larger than the sum of its proper divisors (1).

213373877281 is an equidigital number, since it uses as much as digits as its factorization.

213373877281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2370816, while the sum is 52.

The spelling of 213373877281 in words is "two hundred thirteen billion, three hundred seventy-three million, eight hundred seventy-seven thousand, two hundred eighty-one".