12221221010021 has 4 divisors (see below), whose sum is σ = 12221248193952. Its totient is φ = 12221193826092.

The previous prime is 12221221009969. The next prime is 12221221010059. The reversal of 12221221010021 is 12001012212221.

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 12221221010021 - 2¹⁴ = 12221220993637 is a prime.

It is a super-2 number, since 2×12221221010021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221221013021) 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, 12906065 + ... + 13820598.

It is an arithmetic number, because the mean of its divisors is an integer number (3055312048488).

Almost surely, 2^{12221221010021} is an apocalyptic number.

It is an amenable number.

12221221010021 is a deficient number, since it is larger than the sum of its proper divisors (27183931).

12221221010021 is an equidigital number, since it uses as much as digits as its factorization.

12221221010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27183930.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 12221221010021 its reverse (12001012212221), we get a palindrome (24222233222242).

The spelling of 12221221010021 in words is "twelve trillion, two hundred twenty-one billion, two hundred twenty-one million, ten thousand, twenty-one".