21220122012212 has 12 divisors (see below), whose sum is σ = 37147712772576. Its totient is φ = 10606489791480.

The previous prime is 21220122012169. The next prime is 21220122012233. The reversal of 21220122012212 is 21221022102212.

It is a super-3 number, since 3×21220122012212³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

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, 892790288 + ... + 892814055.

It is an arithmetic number, because the mean of its divisors is an integer number (3095642731048).

Almost surely, 2^{21220122012212} is an apocalyptic number.

It is an amenable number.

21220122012212 is a deficient number, since it is larger than the sum of its proper divisors (15927590760364).

21220122012212 is a wasteful number, since it uses less digits than its factorization.

21220122012212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1785607318 (or 1785607316 counting only the distinct ones).

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

Adding to 21220122012212 its reverse (21221022102212), we get a palindrome (42441144114424).

The spelling of 21220122012212 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty-two million, twelve thousand, two hundred twelve".