21020221111110 has 64 divisors (see below), whose sum is σ = 54353475755712. Its totient is φ = 5171895046656.

The previous prime is 21020221111063. The next prime is 21020221111117. The reversal of 21020221111110 is 1111112202012.

It is a happy number.

It is a super-3 number, since 3×21020221111110³ (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 21020221111110.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020221111117) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11174509 + ... + 12919368.

It is an arithmetic number, because the mean of its divisors is an integer number (849273058683).

Almost surely, 2^{21020221111110} is an apocalyptic number.

21020221111110 is an abundant number, since it is smaller than the sum of its proper divisors (33333254644602).

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

21020221111110 is a wasteful number, since it uses less digits than its factorization.

21020221111110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24096137.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21020221111110 its reverse (1111112202012), we get a palindrome (22131333313122).

The spelling of 21020221111110 in words is "twenty-one trillion, twenty billion, two hundred twenty-one million, one hundred eleven thousand, one hundred ten".