212130421 has 4 divisors (see below), whose sum is σ = 223295200. Its totient is φ = 200965644.

The previous prime is 212130397. The next prime is 212130431. The reversal of 212130421 is 124031212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212130421 - 2⁷ = 212130293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212130395 and 212130404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212130431) 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, 5582361 + ... + 5582398.

It is an arithmetic number, because the mean of its divisors is an integer number (55823800).

Almost surely, 2^212130421 is an apocalyptic number.

It is an amenable number.

212130421 is a deficient number, since it is larger than the sum of its proper divisors (11164779).

212130421 is a wasteful number, since it uses less digits than its factorization.

212130421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11164778.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 212130421 is about 14564.6977654876. The cubic root of 212130421 is about 596.3954451529.

Adding to 212130421 its reverse (124031212), we get a palindrome (336161633).

The spelling of 212130421 in words is "two hundred twelve million, one hundred thirty thousand, four hundred twenty-one".