22111021 has 8 divisors (see below), whose sum is σ = 23103000. Its totient is φ = 21134400.

The previous prime is 22111007. The next prime is 22111039. The reversal of 22111021 is 12011122.

It can be written as a sum of positive squares in 4 ways, for example, as 13176900 + 8934121 = 3630^2 + 2989^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22111021 - 2⁵ = 22110989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22110989 and 22111007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22111051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 846 + ... + 6703.

It is an arithmetic number, because the mean of its divisors is an integer number (2887875).

Almost surely, 2^22111021 is an apocalyptic number.

It is an amenable number.

22111021 is a deficient number, since it is larger than the sum of its proper divisors (991979).

22111021 is a wasteful number, since it uses less digits than its factorization.

22111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7679.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 22111021 is about 4702.2357448346. The cubic root of 22111021 is about 280.6744836457.

Adding to 22111021 its reverse (12011122), we get a palindrome (34122143).

The spelling of 22111021 in words is "twenty-two million, one hundred eleven thousand, twenty-one".