20011021110 has 64 divisors (see below), whose sum is σ = 55084124160. Its totient is φ = 5164132320.

The previous prime is 20011021109. The next prime is 20011021153. The reversal of 20011021110 is 1112011002.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 20011021092 and 20011021101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1187032 + ... + 1203771.

It is an arithmetic number, because the mean of its divisors is an integer number (860689440).

Almost surely, 2^20011021110 is an apocalyptic number.

20011021110 is an abundant number, since it is smaller than the sum of its proper divisors (35073103050).

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

20011021110 is a wasteful number, since it uses less digits than its factorization.

20011021110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2390850 (or 2390844 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 20011021110 its reverse (1112011002), we get a palindrome (21123032112).

The spelling of 20011021110 in words is "twenty billion, eleven million, twenty-one thousand, one hundred ten".