12210051221 has 8 divisors (see below), whose sum is σ = 12632785920. Its totient is φ = 11787429808.

The previous prime is 12210051143. The next prime is 12210051223. The reversal of 12210051221 is 12215001221.

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 12210051221 - 2¹⁸ = 12209789077 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12210051221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12210051223) 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, 231500 + ... + 279306.

It is an arithmetic number, because the mean of its divisors is an integer number (1579098240).

Almost surely, 2^12210051221 is an apocalyptic number.

It is an amenable number.

12210051221 is a deficient number, since it is larger than the sum of its proper divisors (422734699).

12210051221 is an equidigital number, since it uses as much as digits as its factorization.

12210051221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56643.

The product of its (nonzero) digits is 80, while the sum is 17.

Adding to 12210051221 its reverse (12215001221), we get a palindrome (24425052442).

The spelling of 12210051221 in words is "twelve billion, two hundred ten million, fifty-one thousand, two hundred twenty-one".