21210233122 has 24 divisors (see below), whose sum is σ = 34474397904. Its totient is φ = 9782673264.

The previous prime is 21210233117. The next prime is 21210233129. The reversal of 21210233122 is 22133201212.

It is a self number, because there is not a number n which added to its sum of digits gives 21210233122.

It is not an unprimeable number, because it can be changed into a prime (21210233129) 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, 494173 + ... + 535375.

It is an arithmetic number, because the mean of its divisors is an integer number (1436433246).

Almost surely, 2^21210233122 is an apocalyptic number.

21210233122 is a deficient number, since it is larger than the sum of its proper divisors (13264164782).

21210233122 is a wasteful number, since it uses less digits than its factorization.

21210233122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42754 (or 42741 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21210233122 its reverse (22133201212), we get a palindrome (43343434334).

The spelling of 21210233122 in words is "twenty-one billion, two hundred ten million, two hundred thirty-three thousand, one hundred twenty-two".