12221222021021 has 8 divisors (see below), whose sum is σ = 13165745992224. Its totient is φ = 11277330902640.

The previous prime is 12221222021011. The next prime is 12221222021023. The reversal of 12221222021021 is 12012022212221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12221222021021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12221222020984 and 12221222021002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221222021023) 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, 158173091 + ... + 158250336.

It is an arithmetic number, because the mean of its divisors is an integer number (1645718249028).

Almost surely, 2^{12221222021021} is an apocalyptic number.

It is an amenable number.

12221222021021 is a deficient number, since it is larger than the sum of its proper divisors (944523971203).

12221222021021 is a wasteful number, since it uses less digits than its factorization.

12221222021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316426411.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 12221222021021 its reverse (12012022212221), we get a palindrome (24233244233242).

The spelling of 12221222021021 in words is "twelve trillion, two hundred twenty-one billion, two hundred twenty-two million, twenty-one thousand, twenty-one".