21003201020 has 24 divisors (see below), whose sum is σ = 44134407744. Its totient is φ = 8396006976.

The previous prime is 21003201017. The next prime is 21003201053. The reversal of 21003201020 is 2010230012.

It is a happy number.

It is a super-2 number, since 2×21003201020² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21003200992 and 21003201010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 296852 + ... + 360731.

It is an arithmetic number, because the mean of its divisors is an integer number (1838933656).

Almost surely, 2^21003201020 is an apocalyptic number.

21003201020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21003201020 is an abundant number, since it is smaller than the sum of its proper divisors (23131206724).

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

21003201020 is a wasteful number, since it uses less digits than its factorization.

21003201020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659189 (or 659187 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 21003201020 its reverse (2010230012), we get a palindrome (23013431032).

The spelling of 21003201020 in words is "twenty-one billion, three million, two hundred one thousand, twenty".