22101021221 has 4 divisors (see below), whose sum is σ = 22106540832. Its totient is φ = 22095501612.

The previous prime is 22101021169. The next prime is 22101021281. The reversal of 22101021221 is 12212010122.

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 22101021221 - 2³⁴ = 4921152037 is a prime.

It is a super-2 number, since 2×22101021221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22101021196 and 22101021205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22101021281) 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, 2753795 + ... + 2761808.

It is an arithmetic number, because the mean of its divisors is an integer number (5526635208).

Almost surely, 2^22101021221 is an apocalyptic number.

It is an amenable number.

22101021221 is a deficient number, since it is larger than the sum of its proper divisors (5519611).

22101021221 is an equidigital number, since it uses as much as digits as its factorization.

22101021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5519610.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 22101021221 its reverse (12212010122), we get a palindrome (34313031343).

The spelling of 22101021221 in words is "twenty-two billion, one hundred one million, twenty-one thousand, two hundred twenty-one".