21020021121110 has 16 divisors (see below), whose sum is σ = 41275677838032. Its totient is φ = 7643644044000.

The previous prime is 21020021121097. The next prime is 21020021121119. The reversal of 21020021121110 is 1112112002012.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020021121119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95545550441 + ... + 95545550660.

It is an arithmetic number, because the mean of its divisors is an integer number (2579729864877).

Almost surely, 2^{21020021121110} is an apocalyptic number.

21020021121110 is a deficient number, since it is larger than the sum of its proper divisors (20255656716922).

21020021121110 is a wasteful number, since it uses less digits than its factorization.

21020021121110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191091101119.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21020021121110 its reverse (1112112002012), we get a palindrome (22132133123122).

The spelling of 21020021121110 in words is "twenty-one trillion, twenty billion, twenty-one million, one hundred twenty-one thousand, one hundred ten".