22212013 has 4 divisors (see below), whose sum is σ = 23518620. Its totient is φ = 20905408.

The previous prime is 22211993. The next prime is 22212017. The reversal of 22212013 is 31021222.

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 14884164 + 7327849 = 3858^2 + 2707^2 .

It is a cyclic number.

It is not a de Polignac number, because 22212013 - 2¹⁷ = 22080941 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 22211984 and 22212002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22212017) 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, 653278 + ... + 653311.

It is an arithmetic number, because the mean of its divisors is an integer number (5879655).

Almost surely, 2^22212013 is an apocalyptic number.

It is an amenable number.

22212013 is a deficient number, since it is larger than the sum of its proper divisors (1306607).

22212013 is a wasteful number, since it uses less digits than its factorization.

22212013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1306606.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 22212013 is about 4712.9622319726. The cubic root of 22212013 is about 281.1011612148.

Adding to 22212013 its reverse (31021222), we get a palindrome (53233235).

The spelling of 22212013 in words is "twenty-two million, two hundred twelve thousand, thirteen".