20021111212102 has 32 divisors (see below), whose sum is σ = 40322237969664. Its totient is φ = 7200399636000.

The previous prime is 20021111212099. The next prime is 20021111212121. The reversal of 20021111212102 is 20121211112002.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 5000275524 + ... + 5000279527.

It is an arithmetic number, because the mean of its divisors is an integer number (1260069936552).

Almost surely, 2^{20021111212102} is an apocalyptic number.

20021111212102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20021111212102 is an abundant number, since it is smaller than the sum of its proper divisors (20301126757562).

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

20021111212102 is a wasteful number, since it uses less digits than its factorization.

20021111212102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10000555084.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20021111212102 its reverse (20121211112002), we get a palindrome (40142322324104).

The spelling of 20021111212102 in words is "twenty trillion, twenty-one billion, one hundred eleven million, two hundred twelve thousand, one hundred two".