21224403122 has 8 divisors (see below), whose sum is σ = 34285574316. Its totient is φ = 9795878352.

The previous prime is 21224403119. The next prime is 21224403127. The reversal of 21224403122 is 22130442212.

It can be written as a sum of positive squares in 2 ways, for example, as 14832560521 + 6391842601 = 121789^2 + 79949^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21224403127) 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, 408161573 + ... + 408161624.

Almost surely, 2^21224403122 is an apocalyptic number.

21224403122 is a deficient number, since it is larger than the sum of its proper divisors (13061171194).

21224403122 is a wasteful number, since it uses less digits than its factorization.

21224403122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816323212.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21224403122 its reverse (22130442212), we get a palindrome (43354845334).

The spelling of 21224403122 in words is "twenty-one billion, two hundred twenty-four million, four hundred three thousand, one hundred twenty-two".