21202212012222 has 32 divisors (see below), whose sum is σ = 43129120095360. Its totient is φ = 6946780151520.

The previous prime is 21202212012221. The next prime is 21202212012337. The reversal of 21202212012222 is 22221021220212.

It is a super-3 number, since 3×21202212012222³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202212012221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19318488 + ... + 20386475.

It is an arithmetic number, because the mean of its divisors is an integer number (1347785002980).

Almost surely, 2^{21202212012222} is an apocalyptic number.

21202212012222 is an abundant number, since it is smaller than the sum of its proper divisors (21926908083138).

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

21202212012222 is a wasteful number, since it uses less digits than its factorization.

21202212012222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39706488.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21202212012222 its reverse (22221021220212), we get a palindrome (43423233232434).

The spelling of 21202212012222 in words is "twenty-one trillion, two hundred two billion, two hundred twelve million, twelve thousand, two hundred twenty-two".