21020220121110 has 256 divisors, whose sum is σ = 61626073743360. Its totient is φ = 4485035681280.

The previous prime is 21020220121073. The next prime is 21020220121127. The reversal of 21020220121110 is 1112102202012.

It is a super-3 number, since 3×21020220121110³ (a number of 41 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21020220121110.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 200631399 + ... + 200736141.

It is an arithmetic number, because the mean of its divisors is an integer number (240726850560).

Almost surely, 2^{21020220121110} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21020220121110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30813036871680).

21020220121110 is an abundant number, since it is smaller than the sum of its proper divisors (40605853622250).

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

21020220121110 is a wasteful number, since it uses less digits than its factorization.

21020220121110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105883.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21020220121110 its reverse (1112102202012), we get a palindrome (22132322323122).

The spelling of 21020220121110 in words is "twenty-one trillion, twenty billion, two hundred twenty million, one hundred twenty-one thousand, one hundred ten".