20212211231 has 4 divisors (see below), whose sum is σ = 20235154464. Its totient is φ = 20189268000.

The previous prime is 20212211221. The next prime is 20212211249. The reversal of 20212211231 is 13211221202.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20212211231 is a prime.

It is a super-2 number, since 2×20212211231² (a number of 21 digits) 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 (20212211221) 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, 11470295 + ... + 11472056.

It is an arithmetic number, because the mean of its divisors is an integer number (5058788616).

Almost surely, 2^20212211231 is an apocalyptic number.

20212211231 is a deficient number, since it is larger than the sum of its proper divisors (22943233).

20212211231 is an equidigital number, since it uses as much as digits as its factorization.

20212211231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22943232.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 20212211231 its reverse (13211221202), we get a palindrome (33423432433).

The spelling of 20212211231 in words is "twenty billion, two hundred twelve million, two hundred eleven thousand, two hundred thirty-one".