21020020212004 has 12 divisors (see below), whose sum is σ = 40129129495728. Its totient is φ = 9554554641800.

The previous prime is 21020020211989. The next prime is 21020020212011. The reversal of 21020020212004 is 40021202002012.

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 3 ways as a sum of consecutive naturals, for example, 238863866002 + ... + 238863866089.

It is an arithmetic number, because the mean of its divisors is an integer number (3344094124644).

Almost surely, 2^{21020020212004} is an apocalyptic number.

It is an amenable number.

21020020212004 is a deficient number, since it is larger than the sum of its proper divisors (19109109283724).

21020020212004 is a wasteful number, since it uses less digits than its factorization.

21020020212004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477727732106 (or 477727732104 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21020020212004 its reverse (40021202002012), we get a palindrome (61041222214016).

The spelling of 21020020212004 in words is "twenty-one trillion, twenty billion, twenty million, two hundred twelve thousand, four".