12212220021 has 8 divisors (see below), whose sum is σ = 16283851584. Its totient is φ = 8141034240.

The previous prime is 12212219993. The next prime is 12212220061. The reversal of 12212220021 is 12002221221.

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

It is not a de Polignac number, because 12212220021 - 2¹⁷ = 12212088949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12212220061) 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, 41196 + ... + 161621.

It is an arithmetic number, because the mean of its divisors is an integer number (2035481448).

Almost surely, 2^12212220021 is an apocalyptic number.

It is an amenable number.

12212220021 is a deficient number, since it is larger than the sum of its proper divisors (4071631563).

12212220021 is a wasteful number, since it uses less digits than its factorization.

12212220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222891.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 12212220021 its reverse (12002221221), we get a palindrome (24214441242).

The spelling of 12212220021 in words is "twelve billion, two hundred twelve million, two hundred twenty thousand, twenty-one".