22021312231 has 4 divisors (see below), whose sum is σ = 22022110264. Its totient is φ = 22020514200.

The previous prime is 22021312223. The next prime is 22021312249. The reversal of 22021312231 is 13221312022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13221312022 = 2 ⋅6610656011.

It is a cyclic number.

It is not a de Polignac number, because 22021312231 - 2³ = 22021312223 is a prime.

It is a super-2 number, since 2×22021312231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22021312199 and 22021312208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021312031) 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, 356085 + ... + 413326.

It is an arithmetic number, because the mean of its divisors is an integer number (5505527566).

Almost surely, 2^22021312231 is an apocalyptic number.

22021312231 is a deficient number, since it is larger than the sum of its proper divisors (798033).

22021312231 is an equidigital number, since it uses as much as digits as its factorization.

22021312231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798032.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 22021312231 its reverse (13221312022), we get a palindrome (35242624253).

The spelling of 22021312231 in words is "twenty-two billion, twenty-one million, three hundred twelve thousand, two hundred thirty-one".