22101011021 has 4 divisors (see below), whose sum is σ = 22303772700. Its totient is φ = 21898249344.

The previous prime is 22101011011. The next prime is 22101011039. The reversal of 22101011021 is 12011010122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12011010122 = 2 ⋅6005505061.

It can be written as a sum of positive squares in 2 ways, for example, as 9003352996 + 13097658025 = 94886^2 + 114445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22101011021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22101010993 and 22101011011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22101011011) 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, 101380676 + ... + 101380893.

It is an arithmetic number, because the mean of its divisors is an integer number (5575943175).

Almost surely, 2^22101011021 is an apocalyptic number.

It is an amenable number.

22101011021 is a deficient number, since it is larger than the sum of its proper divisors (202761679).

22101011021 is a wasteful number, since it uses less digits than its factorization.

22101011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202761678.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 22101011021 its reverse (12011010122), we get a palindrome (34112021143).

It can be divided in two parts, 2210101 and 1021, that added together give a palindrome (2211122).

The spelling of 22101011021 in words is "twenty-two billion, one hundred one million, eleven thousand, twenty-one".