20021100111210 has 256 divisors, whose sum is σ = 54848142655488. Its totient is φ = 4635118387200.

The previous prime is 20021100111193. The next prime is 20021100111211. The reversal of 20021100111210 is 1211100112002.

It is not an unprimeable number, because it can be changed into a prime (20021100111211) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 106723654 + ... + 106911086.

It is an arithmetic number, because the mean of its divisors is an integer number (214250557248).

Almost surely, 2^{20021100111210} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20021100111210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27424071327744).

20021100111210 is an abundant number, since it is smaller than the sum of its proper divisors (34827042544278).

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

20021100111210 is a wasteful number, since it uses less digits than its factorization.

20021100111210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187669.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20021100111210 its reverse (1211100112002), we get a palindrome (21232200223212).

The spelling of 20021100111210 in words is "twenty trillion, twenty-one billion, one hundred million, one hundred eleven thousand, two hundred ten".