22221221001021 has 20 divisors (see below), whose sum is σ = 37936758253152. Its totient is φ = 12697840571688.

The previous prime is 22221221000873. The next prime is 22221221001061. The reversal of 22221221001021 is 12010012212222.

It is a happy number.

22221221001021 is a `hidden beast` number, since 222 + 212 + 210 + 0 + 1 + 0 + 21 = 666.

It is not a de Polignac number, because 22221221001021 - 2¹⁰ = 22221220999997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22221221000985 and 22221221001003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221221001061) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 19595432415 + ... + 19595433548.

Almost surely, 2^{22221221001021} is an apocalyptic number.

22221221001021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22221221001021 is a deficient number, since it is larger than the sum of its proper divisors (15715537252131).

22221221001021 is an equidigital number, since it uses as much as digits as its factorization.

22221221001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39190865982 (or 39190865973 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 22221221001021 its reverse (12010012212222), we get a palindrome (34231233213243).

The spelling of 22221221001021 in words is "twenty-two trillion, two hundred twenty-one billion, two hundred twenty-one million, one thousand, twenty-one".