212715421 has 6 divisors (see below), whose sum is σ = 218031866. Its totient is φ = 207525600.

The previous prime is 212715413. The next prime is 212715457. The reversal of 212715421 is 124517212.

It can be written as a sum of positive squares in 3 ways, for example, as 3189796 + 209525625 = 1786^2 + 14475^2 .

It is not a de Polignac number, because 212715421 - 2³ = 212715413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212715401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 61590 + ... + 64951.

Almost surely, 2^212715421 is an apocalyptic number.

It is an amenable number.

212715421 is a deficient number, since it is larger than the sum of its proper divisors (5316445).

212715421 is an equidigital number, since it uses as much as digits as its factorization.

212715421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126623 (or 126582 counting only the distinct ones).

The product of its digits is 1120, while the sum is 25.

The square root of 212715421 is about 14584.7667447923. The cubic root of 212715421 is about 596.9431759739.

The spelling of 212715421 in words is "two hundred twelve million, seven hundred fifteen thousand, four hundred twenty-one".