21202222211212 has 48 divisors (see below), whose sum is σ = 44929725744960. Its totient is φ = 8546270717952.

The previous prime is 21202222211167. The next prime is 21202222211237. The reversal of 21202222211212 is 21211222220212.

It is a super-2 number, since 2×21202222211212² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14636137 + ... + 16019392.

It is an arithmetic number, because the mean of its divisors is an integer number (936035953020).

Almost surely, 2^{21202222211212} is an apocalyptic number.

It is an amenable number.

21202222211212 is an abundant number, since it is smaller than the sum of its proper divisors (23727503533748).

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

21202222211212 is a wasteful number, since it uses less digits than its factorization.

21202222211212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30657010 (or 30657008 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 21202222211212 its reverse (21211222220212), we get a palindrome (42413444431424).

The spelling of 21202222211212 in words is "twenty-one trillion, two hundred two billion, two hundred twenty-two million, two hundred eleven thousand, two hundred twelve".