20121222231 has 40 divisors (see below), whose sum is σ = 32807318544. Its totient is φ = 12188292480.

The previous prime is 20121222193. The next prime is 20121222263. The reversal of 20121222231 is 13222212102.

20121222231 is a `hidden beast` number, since 201 + 212 + 22 + 231 = 666.

It is not a de Polignac number, because 20121222231 - 2¹⁴ = 20121205847 is a prime.

It is a super-2 number, since 2×20121222231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121222271) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2127445 + ... + 2136881.

Almost surely, 2^20121222231 is an apocalyptic number.

20121222231 is a deficient number, since it is larger than the sum of its proper divisors (12686096313).

20121222231 is a wasteful number, since it uses less digits than its factorization.

20121222231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11853 (or 11844 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 20121222231 its reverse (13222212102), we get a palindrome (33343434333).

The spelling of 20121222231 in words is "twenty billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred thirty-one".