12221121010021 has 16 divisors (see below), whose sum is σ = 15324795854208. Its totient is φ = 9467905464000.

The previous prime is 12221121010001. The next prime is 12221121010069. The reversal of 12221121010021 is 12001012112221.

It is a cyclic number.

It is not a de Polignac number, because 12221121010021 - 2¹⁷ = 12221120878949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12221121009977 and 12221121010004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221121010001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 458703030 + ... + 458729671.

It is an arithmetic number, because the mean of its divisors is an integer number (957799740888).

Almost surely, 2^{12221121010021} is an apocalyptic number.

12221121010021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12221121010021 is a deficient number, since it is larger than the sum of its proper divisors (3103674844187).

12221121010021 is a wasteful number, since it uses less digits than its factorization.

12221121010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917432892.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 12221121010021 its reverse (12001012112221), we get a palindrome (24222133122242).

The spelling of 12221121010021 in words is "twelve trillion, two hundred twenty-one billion, one hundred twenty-one million, ten thousand, twenty-one".