212571705427 has 4 divisors (see below), whose sum is σ = 213356103136. Its totient is φ = 211787307720.

The previous prime is 212571705391. The next prime is 212571705491. The reversal of 212571705427 is 724507175212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212571705427 is a prime.

It is a super-2 number, since 2×212571705427² (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 (212571705527) 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, 392198448 + ... + 392198989.

It is an arithmetic number, because the mean of its divisors is an integer number (53339025784).

Almost surely, 2^212571705427 is an apocalyptic number.

212571705427 is a deficient number, since it is larger than the sum of its proper divisors (784397709).

212571705427 is an equidigital number, since it uses as much as digits as its factorization.

212571705427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784397708.

The product of its (nonzero) digits is 274400, while the sum is 43.

The spelling of 212571705427 in words is "two hundred twelve billion, five hundred seventy-one million, seven hundred five thousand, four hundred twenty-seven".