21020020002010 has 16 divisors (see below), whose sum is σ = 37837568457576. Its totient is φ = 8407667455488.

The previous prime is 21020020001989. The next prime is 21020020002019. The reversal of 21020020002010 is 1020002002012.

It can be written as a sum of positive squares in 4 ways, for example, as 20839873235041 + 180146766969 = 4565071^2 + 424437^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (21020020002019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42308847 + ... + 42802786.

Almost surely, 2^{21020020002010} is an apocalyptic number.

21020020002010 is a deficient number, since it is larger than the sum of its proper divisors (16817548455566).

21020020002010 is a wasteful number, since it uses less digits than its factorization.

21020020002010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85136337.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 21020020002010 its reverse (1020002002012), we get a palindrome (22040022004022).

The spelling of 21020020002010 in words is "twenty-one trillion, twenty billion, twenty million, two thousand, ten".