21211112122 has 8 divisors (see below), whose sum is σ = 31849573536. Its totient is φ = 10594587612.

The previous prime is 21211112017. The next prime is 21211112147. The reversal of 21211112122 is 22121111212.

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

It is a super-2 number, since 2×21211112122² (a number of 21 digits) contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 21211112096 and 21211112105.

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, 5481808 + ... + 5485675.

It is an arithmetic number, because the mean of its divisors is an integer number (3981196692).

Almost surely, 2^21211112122 is an apocalyptic number.

21211112122 is a deficient number, since it is larger than the sum of its proper divisors (10638461414).

21211112122 is a wasteful number, since it uses less digits than its factorization.

21211112122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10968452.

The product of its digits is 32, while the sum is 16.

Adding to 21211112122 its reverse (22121111212), we get a palindrome (43332223334).

It can be divided in two parts, 2121111212 and 2, that multiplied together give a palindrome (4242222424).

The spelling of 21211112122 in words is "twenty-one billion, two hundred eleven million, one hundred twelve thousand, one hundred twenty-two".