21201222120212 has 12 divisors (see below), whose sum is σ = 37102942336320. Its totient is φ = 10600381452696.

The previous prime is 21201222120161. The next prime is 21201222120233. The reversal of 21201222120212 is 21202122210212.

It is a super-2 number, since 2×21201222120212² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57194012 + ... + 57563507.

It is an arithmetic number, because the mean of its divisors is an integer number (3091911861360).

Almost surely, 2^{21201222120212} is an apocalyptic number.

It is an amenable number.

21201222120212 is a deficient number, since it is larger than the sum of its proper divisors (15901720216108).

21201222120212 is a wasteful number, since it uses less digits than its factorization.

21201222120212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114803710 (or 114803708 counting only the distinct ones).

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

Adding to 21201222120212 its reverse (21202122210212), we get a palindrome (42403344330424).

The spelling of 21201222120212 in words is "twenty-one trillion, two hundred one billion, two hundred twenty-two million, one hundred twenty thousand, two hundred twelve".