21010220110020 has 48 divisors (see below), whose sum is σ = 58830191663040. Its totient is φ = 5602575328896.

The previous prime is 21010220109947. The next prime is 21010220110049. The reversal of 21010220110020 is 2001102201012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 21010220109978 and 21010220110005.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2420230 + ... + 6919389.

It is an arithmetic number, because the mean of its divisors is an integer number (1225628992980).

Almost surely, 2^{21010220110020} is an apocalyptic number.

21010220110020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21010220110020 is an abundant number, since it is smaller than the sum of its proper divisors (37819971553020).

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

21010220110020 is a wasteful number, since it uses less digits than its factorization.

21010220110020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9377124 (or 9377122 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21010220110020 its reverse (2001102201012), we get a palindrome (23011322311032).

The spelling of 21010220110020 in words is "twenty-one trillion, ten billion, two hundred twenty million, one hundred ten thousand, twenty".