21213120122 has 8 divisors (see below), whose sum is σ = 31956246036. Its totient is φ = 10561038112.

The previous prime is 21213120119. The next prime is 21213120143. The reversal of 21213120122 is 22102131212.

It can be written as a sum of positive squares in 2 ways, for example, as 20868980521 + 344139601 = 144461^2 + 18551^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 21213120122.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22760393 + ... + 22761324.

Almost surely, 2^21213120122 is an apocalyptic number.

21213120122 is a deficient number, since it is larger than the sum of its proper divisors (10743125914).

21213120122 is a wasteful number, since it uses less digits than its factorization.

21213120122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45521952.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21213120122 its reverse (22102131212), we get a palindrome (43315251334).

The spelling of 21213120122 in words is "twenty-one billion, two hundred thirteen million, one hundred twenty thousand, one hundred twenty-two".