22121123021 has 4 divisors (see below), whose sum is σ = 22483764444. Its totient is φ = 21758481600.

The previous prime is 22121123009. The next prime is 22121123029. The reversal of 22121123021 is 12032112122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12273537796 + 9847585225 = 110786^2 + 99235^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22121123021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121123029) 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, 181320620 + ... + 181320741.

It is an arithmetic number, because the mean of its divisors is an integer number (5620941111).

Almost surely, 2^22121123021 is an apocalyptic number.

It is an amenable number.

22121123021 is a deficient number, since it is larger than the sum of its proper divisors (362641423).

22121123021 is an equidigital number, since it uses as much as digits as its factorization.

22121123021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362641422.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 22121123021 its reverse (12032112122), we get a palindrome (34153235143).

The spelling of 22121123021 in words is "twenty-two billion, one hundred twenty-one million, one hundred twenty-three thousand, twenty-one".