21110022212 has 6 divisors (see below), whose sum is σ = 36942538878. Its totient is φ = 10555011104.

The previous prime is 21110022203. The next prime is 21110022259. The reversal of 21110022212 is 21222001112.

It can be written as a sum of positive squares in only one way, i.e., 19040136196 + 2069886016 = 137986^2 + 45496^2 .

It is a super-2 number, since 2×21110022212² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2638752773 + ... + 2638752780.

It is an arithmetic number, because the mean of its divisors is an integer number (6157089813).

Almost surely, 2^21110022212 is an apocalyptic number.

It is an amenable number.

21110022212 is a deficient number, since it is larger than the sum of its proper divisors (15832516666).

21110022212 is a wasteful number, since it uses less digits than its factorization.

21110022212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5277505557 (or 5277505555 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21110022212 its reverse (21222001112), we get a palindrome (42332023324).

The spelling of 21110022212 in words is "twenty-one billion, one hundred ten million, twenty-two thousand, two hundred twelve".