22101021 has 12 divisors (see below), whose sum is σ = 32139900. Its totient is φ = 14634240.

The previous prime is 22100959. The next prime is 22101029. The reversal of 22101021 is 12010122.

It can be written as a sum of positive squares in 2 ways, for example, as 5405625 + 16695396 = 2325^2 + 4086^2 .

It is not a de Polignac number, because 22101021 - 2⁷ = 22100893 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 22100994 and 22101012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22101029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6900 + ... + 9581.

It is an arithmetic number, because the mean of its divisors is an integer number (2678325).

Almost surely, 2^22101021 is an apocalyptic number.

It is an amenable number.

22101021 is a deficient number, since it is larger than the sum of its proper divisors (10038879).

22101021 is a wasteful number, since it uses less digits than its factorization.

22101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16636 (or 16633 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 22101021 is about 4701.1723006076. The cubic root of 22101021 is about 280.6321643566.

Adding to 22101021 its reverse (12010122), we get a palindrome (34111143).

The spelling of 22101021 in words is "twenty-two million, one hundred one thousand, twenty-one".