21032003100 has 72 divisors (see below), whose sum is σ = 60867493120. Its totient is φ = 5607161280.

The previous prime is 21032003039. The next prime is 21032003171. The reversal of 21032003100 is 130023012.

It is a happy number.

It is a super-2 number, since 2×21032003100² (a number of 21 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2005671 + ... + 2016129.

Almost surely, 2^21032003100 is an apocalyptic number.

21032003100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21032003100 is an abundant number, since it is smaller than the sum of its proper divisors (39835490020).

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

21032003100 is a wasteful number, since it uses less digits than its factorization.

21032003100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17179 (or 17172 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 21032003100 its reverse (130023012), we get a palindrome (21162026112).

The spelling of 21032003100 in words is "twenty-one billion, thirty-two million, three thousand, one hundred".