21221000022212 has 12 divisors (see below), whose sum is σ = 37403920903440. Its totient is φ = 10534165478376.

The previous prime is 21221000022191. The next prime is 21221000022227. The reversal of 21221000022212 is 21222000012212.

It is a happy 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 3 ways as a sum of consecutive naturals, for example, 19083632558 + ... + 19083633669.

It is an arithmetic number, because the mean of its divisors is an integer number (3116993408620).

Almost surely, 2^{21221000022212} is an apocalyptic number.

It is an amenable number.

21221000022212 is a deficient number, since it is larger than the sum of its proper divisors (16182920881228).

21221000022212 is a wasteful number, since it uses less digits than its factorization.

21221000022212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38167266370 (or 38167266368 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21221000022212 its reverse (21222000012212), we get a palindrome (42443000034424).

It can be divided in two parts, 212210000 and 22212, that added together give a palindrome (212232212).

The spelling of 21221000022212 in words is "twenty-one trillion, two hundred twenty-one billion, twenty-two thousand, two hundred twelve".