20021221110212 has 72 divisors (see below), whose sum is σ = 43156341986688. Its totient is φ = 8075532729600.

The previous prime is 20021221110197. The next prime is 20021221110227. The reversal of 20021221110212 is 21201112212002.

It is an interprime number because it is at equal distance from previous prime (20021221110197) and next prime (20021221110227).

It is a Harshad number since it is a multiple of its sum of digits (17).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 134775137 + ... + 134923607.

It is an arithmetic number, because the mean of its divisors is an integer number (599393638704).

Almost surely, 2^{20021221110212} is an apocalyptic number.

It is an amenable number.

20021221110212 is an abundant number, since it is smaller than the sum of its proper divisors (23135120876476).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20021221110212 is a wasteful number, since it uses less digits than its factorization.

20021221110212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188977 (or 188968 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20021221110212 its reverse (21201112212002), we get a palindrome (41222333322214).

The spelling of 20021221110212 in words is "twenty trillion, twenty-one billion, two hundred twenty-one million, one hundred ten thousand, two hundred twelve".