20011231222 has 4 divisors (see below), whose sum is σ = 30016846836. Its totient is φ = 10005615610.

The previous prime is 20011231211. The next prime is 20011231277. The reversal of 20011231222 is 22213211002.

It is a happy number.

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

It is a super-2 number, since 2×20011231222² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20011231196 and 20011231205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5002807804 + ... + 5002807807.

It is an arithmetic number, because the mean of its divisors is an integer number (7504211709).

Almost surely, 2^20011231222 is an apocalyptic number.

20011231222 is a deficient number, since it is larger than the sum of its proper divisors (10005615614).

20011231222 is a wasteful number, since it uses less digits than its factorization.

20011231222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10005615613.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20011231222 its reverse (22213211002), we get a palindrome (42224442224).

The spelling of 20011231222 in words is "twenty billion, eleven million, two hundred thirty-one thousand, two hundred twenty-two".