21221121120212 has 24 divisors (see below), whose sum is σ = 40003042144800. Its totient is φ = 9792063805536.

The previous prime is 21221121120203. The next prime is 21221121120217. The reversal of 21221121120212 is 21202112112212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221121120217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47688662 + ... + 48131597.

It is an arithmetic number, because the mean of its divisors is an integer number (1666793422700).

Almost surely, 2^{21221121120212} is an apocalyptic number.

It is an amenable number.

21221121120212 is a deficient number, since it is larger than the sum of its proper divisors (18781921024588).

21221121120212 is a wasteful number, since it uses less digits than its factorization.

21221121120212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95824535 (or 95824533 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21221121120212 its reverse (21202112112212), we get a palindrome (42423233232424).

The spelling of 21221121120212 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred twenty thousand, two hundred twelve".