20212231 has 12 divisors (see below), whose sum is σ = 22033200. Its totient is φ = 18532800.

The previous prime is 20212223. The next prime is 20212259. The reversal of 20212231 is 13221202.

It is not a de Polignac number, because 20212231 - 2³ = 20212223 is a prime.

It is a super-2 number, since 2×20212231² = 817068563994722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33331 + ... + 33931.

It is an arithmetic number, because the mean of its divisors is an integer number (1836100).

Almost surely, 2^20212231 is an apocalyptic number.

20212231 is a deficient number, since it is larger than the sum of its proper divisors (1820969).

20212231 is a wasteful number, since it uses less digits than its factorization.

20212231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 826 (or 813 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 20212231 is about 4495.8014858310. The cubic root of 20212231 is about 272.3985246272.

Adding to 20212231 its reverse (13221202), we get a palindrome (33433433).

The spelling of 20212231 in words is "twenty million, two hundred twelve thousand, two hundred thirty-one".