21142122212 has 12 divisors (see below), whose sum is σ = 37444482096. Its totient is φ = 10443698760.

The previous prime is 21142122203. The next prime is 21142122257. The reversal of 21142122212 is 21222124112.

It is a happy number.

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

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, 31840214 + ... + 31840877.

It is an arithmetic number, because the mean of its divisors is an integer number (3120373508).

Almost surely, 2^21142122212 is an apocalyptic number.

It is an amenable number.

21142122212 is a deficient number, since it is larger than the sum of its proper divisors (16302359884).

21142122212 is a wasteful number, since it uses less digits than its factorization.

21142122212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63681178 (or 63681176 counting only the distinct ones).

The product of its digits is 256, while the sum is 20.

Adding to 21142122212 its reverse (21222124112), we get a palindrome (42364246324).

The spelling of 21142122212 in words is "twenty-one billion, one hundred forty-two million, one hundred twenty-two thousand, two hundred twelve".