21020101110 has 24 divisors (see below), whose sum is σ = 54652263120. Its totient is φ = 5605360272.

The previous prime is 21020101099. The next prime is 21020101127. The reversal of 21020101110 is 1110102012.

It is a happy number.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21020101092 and 21020101101.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 116778250 + ... + 116778429.

It is an arithmetic number, because the mean of its divisors is an integer number (2277177630).

Almost surely, 2^21020101110 is an apocalyptic number.

21020101110 is an abundant number, since it is smaller than the sum of its proper divisors (33632162010).

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

21020101110 is a wasteful number, since it uses less digits than its factorization.

21020101110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233556692 (or 233556689 counting only the distinct ones).

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

Adding to 21020101110 its reverse (1110102012), we get a palindrome (22130203122).

The spelling of 21020101110 in words is "twenty-one billion, twenty million, one hundred one thousand, one hundred ten".