21114221020020 has 72 divisors (see below), whose sum is σ = 65096412599400. Its totient is φ = 5538156330240.

The previous prime is 21114221019923. The next prime is 21114221020223. The reversal of 21114221020020 is 2002012241112.

21114221020020 is a `hidden beast` number, since 2 + 1 + 11 + 422 + 10 + 200 + 20 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 520250608656 + 20593970411364 = 721284^2 + 4538058^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21114221019975 and 21114221020002.

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 23 ways as a sum of consecutive naturals, for example, 961474495 + ... + 961496454.

Almost surely, 2^{21114221020020} is an apocalyptic number.

21114221020020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21114221020020 is an abundant number, since it is smaller than the sum of its proper divisors (43982191579380).

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

21114221020020 is a wasteful number, since it uses less digits than its factorization.

21114221020020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1922971025 (or 1922971020 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21114221020020 its reverse (2002012241112), we get a palindrome (23116233261132).

The spelling of 21114221020020 in words is "twenty-one trillion, one hundred fourteen billion, two hundred twenty-one million, twenty thousand, twenty".