21021212222210 has 16 divisors (see below), whose sum is σ = 37839686175936. Its totient is φ = 8408150627568.

The previous prime is 21021212222183. The next prime is 21021212222233. The reversal of 21021212222210 is 1222221212012.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41518454 + ... + 42021713.

It is an arithmetic number, because the mean of its divisors is an integer number (2364980385996).

Almost surely, 2^{21021212222210} is an apocalyptic number.

21021212222210 is a deficient number, since it is larger than the sum of its proper divisors (16818473953726).

21021212222210 is a wasteful number, since it uses less digits than its factorization.

21021212222210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83565337.

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

Adding to 21021212222210 its reverse (1222221212012), we get a palindrome (22243433434222).

The spelling of 21021212222210 in words is "twenty-one trillion, twenty-one billion, two hundred twelve million, two hundred twenty-two thousand, two hundred ten".