12122212021 has 8 divisors (see below), whose sum is σ = 12763940000. Its totient is φ = 11480855760.

The previous prime is 12122211991. The next prime is 12122212033. The reversal of 12122212021 is 12021222121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12122212021 - 2⁵ = 12122211989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12122211986 and 12122212004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12122212621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24690 + ... + 157651.

It is an arithmetic number, because the mean of its divisors is an integer number (1595492500).

Almost surely, 2^12122212021 is an apocalyptic number.

It is an amenable number.

12122212021 is a deficient number, since it is larger than the sum of its proper divisors (641727979).

12122212021 is a wasteful number, since it uses less digits than its factorization.

12122212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185859.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 12122212021 its reverse (12021222121), we get a palindrome (24143434142).

The spelling of 12122212021 in words is "twelve billion, one hundred twenty-two million, two hundred twelve thousand, twenty-one".