12221100021 has 32 divisors (see below), whose sum is σ = 17655904000. Its totient is φ = 7474664448.

The previous prime is 12221100019. The next prime is 12221100041. The reversal of 12221100021 is 12000112221.

It is not a de Polignac number, because 12221100021 - 2¹ = 12221100019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221100011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8206845 + ... + 8208333.

It is an arithmetic number, because the mean of its divisors is an integer number (551747000).

Almost surely, 2^12221100021 is an apocalyptic number.

It is an amenable number.

12221100021 is a deficient number, since it is larger than the sum of its proper divisors (5434803979).

12221100021 is a wasteful number, since it uses less digits than its factorization.

12221100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2653.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 12221100021 its reverse (12000112221), we get a palindrome (24221212242).

The spelling of 12221100021 in words is "twelve billion, two hundred twenty-one million, one hundred thousand, twenty-one".