22101220021 has 4 divisors (see below), whose sum is σ = 22101720832. Its totient is φ = 22100719212.

The previous prime is 22101219989. The next prime is 22101220069. The reversal of 22101220021 is 12002210122.

It is a happy number.

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 22101220021 - 2⁵ = 22101219989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22101219983 and 22101220010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22101220091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 177045 + ... + 274858.

It is an arithmetic number, because the mean of its divisors is an integer number (5525430208).

Almost surely, 2^22101220021 is an apocalyptic number.

It is an amenable number.

22101220021 is a deficient number, since it is larger than the sum of its proper divisors (500811).

22101220021 is an equidigital number, since it uses as much as digits as its factorization.

22101220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500810.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 22101220021 its reverse (12002210122), we get a palindrome (34103430143).

The spelling of 22101220021 in words is "twenty-two billion, one hundred one million, two hundred twenty thousand, twenty-one".