12222020021 has 4 divisors (see below), whose sum is σ = 12233518752. Its totient is φ = 12210521292.

The previous prime is 12222019987. The next prime is 12222020023. The reversal of 12222020021 is 12002022221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12222020021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12222019978 and 12222020005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12222020023) 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, 5747771 + ... + 5749896.

It is an arithmetic number, because the mean of its divisors is an integer number (3058379688).

Almost surely, 2^12222020021 is an apocalyptic number.

It is an amenable number.

12222020021 is a deficient number, since it is larger than the sum of its proper divisors (11498731).

12222020021 is a wasteful number, since it uses less digits than its factorization.

12222020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11498730.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 12222020021 its reverse (12002022221), we get a palindrome (24224042242).

It can be divided in two parts, 122220 and 20021, that added together give a palindrome (142241).

The spelling of 12222020021 in words is "twelve billion, two hundred twenty-two million, twenty thousand, twenty-one".