12210220021 has 4 divisors (see below), whose sum is σ = 12852863200. Its totient is φ = 11567576844.

The previous prime is 12210220019. The next prime is 12210220027. The reversal of 12210220021 is 12002201221.

It is a happy number.

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 not a de Polignac number, because 12210220021 - 2¹ = 12210220019 is a prime.

It is a super-2 number, since 2×12210220021² (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 = 12210219983 and 12210220010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12210220027) 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, 321321561 + ... + 321321598.

It is an arithmetic number, because the mean of its divisors is an integer number (3213215800).

Almost surely, 2^12210220021 is an apocalyptic number.

It is an amenable number.

12210220021 is a deficient number, since it is larger than the sum of its proper divisors (642643179).

12210220021 is an equidigital number, since it uses as much as digits as its factorization.

12210220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642643178.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 12210220021 its reverse (12002201221), we get a palindrome (24212421242).

The spelling of 12210220021 in words is "twelve billion, two hundred ten million, two hundred twenty thousand, twenty-one".