212021231 has 4 divisors (see below), whose sum is σ = 212116464. Its totient is φ = 211926000.

The previous prime is 212021213. The next prime is 212021237. The reversal of 212021231 is 132120212.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 212021231 - 2²⁶ = 144912367 is a prime.

It is a super-2 number, since 2×212021231² = 89906004789510722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021237) 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, 44195 + ... + 48756.

It is an arithmetic number, because the mean of its divisors is an integer number (53029116).

Almost surely, 2^212021231 is an apocalyptic number.

212021231 is a deficient number, since it is larger than the sum of its proper divisors (95233).

212021231 is an equidigital number, since it uses as much as digits as its factorization.

212021231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95232.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 212021231 is about 14560.9488358417. The cubic root of 212021231 is about 596.2930999468.

Adding to 212021231 its reverse (132120212), we get a palindrome (344141443).

The spelling of 212021231 in words is "two hundred twelve million, twenty-one thousand, two hundred thirty-one".