212391682577 has 4 divisors (see below), whose sum is σ = 212882194980. Its totient is φ = 211901170176.

The previous prime is 212391682541. The next prime is 212391682583. The reversal of 212391682577 is 775286193212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35524333441 + 176867349136 = 188479^2 + 420556^2 .

It is a cyclic number.

It is not a de Polignac number, because 212391682577 - 2¹⁶ = 212391617041 is a prime.

It is a super-2 number, since 2×212391682577² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212391682177) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 245255552 + ... + 245256417.

It is an arithmetic number, because the mean of its divisors is an integer number (53220548745).

Almost surely, 2^212391682577 is an apocalyptic number.

It is an amenable number.

212391682577 is a deficient number, since it is larger than the sum of its proper divisors (490512403).

212391682577 is an equidigital number, since it uses as much as digits as its factorization.

212391682577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490512402.

The product of its digits is 2540160, while the sum is 53.

The spelling of 212391682577 in words is "two hundred twelve billion, three hundred ninety-one million, six hundred eighty-two thousand, five hundred seventy-seven".