212412421 has 4 divisors (see below), whose sum is σ = 228751852. Its totient is φ = 196072992.

The previous prime is 212412413. The next prime is 212412451. The reversal of 212412421 is 124214212.

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 66341025 + 146071396 = 8145^2 + 12086^2 .

It is a cyclic number.

It is not a de Polignac number, because 212412421 - 2³ = 212412413 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 (212412451) 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, 8169696 + ... + 8169721.

It is an arithmetic number, because the mean of its divisors is an integer number (57187963).

Almost surely, 2^212412421 is an apocalyptic number.

It is an amenable number.

212412421 is a deficient number, since it is larger than the sum of its proper divisors (16339431).

212412421 is a wasteful number, since it uses less digits than its factorization.

212412421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16339430.

The product of its digits is 256, while the sum is 19.

The square root of 212412421 is about 14574.3754926240. The cubic root of 212412421 is about 596.6596050404.

Adding to 212412421 its reverse (124214212), we get a palindrome (336626633).

The spelling of 212412421 in words is "two hundred twelve million, four hundred twelve thousand, four hundred twenty-one".