21002220021112 has 32 divisors (see below), whose sum is σ = 42974956523520. Its totient is φ = 9542936953440.

The previous prime is 21002220021077. The next prime is 21002220021121. The reversal of 21002220021112 is 21112002220012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43844088 + ... + 44320519.

It is an arithmetic number, because the mean of its divisors is an integer number (1342967391360).

Almost surely, 2^{21002220021112} is an apocalyptic number.

21002220021112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21002220021112 is an abundant number, since it is smaller than the sum of its proper divisors (21972736502408).

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

21002220021112 is a wasteful number, since it uses less digits than its factorization.

21002220021112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88167331 (or 88167327 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21002220021112 its reverse (21112002220012), we get a palindrome (42114222241124).

The spelling of 21002220021112 in words is "twenty-one trillion, two billion, two hundred twenty million, twenty-one thousand, one hundred twelve".