21221012222212 has 12 divisors (see below), whose sum is σ = 40512841515216. Its totient is φ = 9645914646440.

The previous prime is 21221012222197. The next prime is 21221012222243. The reversal of 21221012222212 is 21222221012212.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 241147866118 + ... + 241147866205.

It is an arithmetic number, because the mean of its divisors is an integer number (3376070126268).

Almost surely, 2^{21221012222212} is an apocalyptic number.

21221012222212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21221012222212 is a deficient number, since it is larger than the sum of its proper divisors (19291829293004).

21221012222212 is a wasteful number, since it uses less digits than its factorization.

21221012222212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482295732338 (or 482295732336 counting only the distinct ones).

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

Adding to 21221012222212 its reverse (21222221012212), we get a palindrome (42443233234424).

The spelling of 21221012222212 in words is "twenty-one trillion, two hundred twenty-one billion, twelve million, two hundred twenty-two thousand, two hundred twelve".