21211212122 has 8 divisors (see below), whose sum is σ = 33200158176. Its totient is φ = 10144492732.

The previous prime is 21211212109. The next prime is 21211212133. The reversal of 21211212122 is 22121211212.

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

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 21211212122.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230556608 + ... + 230556699.

It is an arithmetic number, because the mean of its divisors is an integer number (4150019772).

Almost surely, 2^21211212122 is an apocalyptic number.

21211212122 is a deficient number, since it is larger than the sum of its proper divisors (11988946054).

21211212122 is a wasteful number, since it uses less digits than its factorization.

21211212122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461113332.

The product of its digits is 64, while the sum is 17.

Adding to 21211212122 its reverse (22121211212), we get a palindrome (43332423334).

The spelling of 21211212122 in words is "twenty-one billion, two hundred eleven million, two hundred twelve thousand, one hundred twenty-two".