21201200022212 has 24 divisors (see below), whose sum is σ = 44634105311040. Its totient is φ = 8608006023840.

The previous prime is 21201200022187. The next prime is 21201200022229. The reversal of 21201200022212 is 21222000210212.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19925939339 + ... + 19925940402.

It is an arithmetic number, because the mean of its divisors is an integer number (1859754387960).

Almost surely, 2^{21201200022212} is an apocalyptic number.

It is an amenable number.

21201200022212 is an abundant number, since it is smaller than the sum of its proper divisors (23432905288828).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21201200022212 is a wasteful number, since it uses less digits than its factorization.

21201200022212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39851879771 (or 39851879769 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21201200022212 its reverse (21222000210212), we get a palindrome (42423200232424).

The spelling of 21201200022212 in words is "twenty-one trillion, two hundred one billion, two hundred million, twenty-two thousand, two hundred twelve".