22001213 has 16 divisors (see below), whose sum is σ = 25338096. Its totient is φ = 18923520.

The previous prime is 22001209. The next prime is 22001237. The reversal of 22001213 is 31210022.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 6017209 + 15984004 = 2453^2 + 3998^2 .

It is a cyclic number.

It is not a de Polignac number, because 22001213 - 2² = 22001209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22001194 and 22001203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22001113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24533 + ... + 25413.

It is an arithmetic number, because the mean of its divisors is an integer number (1583631).

Almost surely, 2^22001213 is an apocalyptic number.

It is an amenable number.

22001213 is a deficient number, since it is larger than the sum of its proper divisors (3336883).

22001213 is a wasteful number, since it uses less digits than its factorization.

22001213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 22001213 is about 4690.5450642756. The cubic root of 22001213 is about 280.2090827795.

Adding to 22001213 its reverse (31210022), we get a palindrome (53211235).

The spelling of 22001213 in words is "twenty-two million, one thousand, two hundred thirteen".