21032002100 has 36 divisors (see below), whose sum is σ = 45672141900. Its totient is φ = 8406773760.

The previous prime is 21032002099. The next prime is 21032002127. The reversal of 21032002100 is 120023012.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 3853181476 + 17178820624 = 62074^2 + 131068^2 .

It is a super-2 number, since 2×21032002100² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66266 + ... + 215534.

Almost surely, 2^21032002100 is an apocalyptic number.

21032002100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21032002100 is an abundant number, since it is smaller than the sum of its proper divisors (24640139800).

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

21032002100 is a wasteful number, since it uses less digits than its factorization.

21032002100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150692 (or 150685 counting only the distinct ones).

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

Adding to 21032002100 its reverse (120023012), we get a palindrome (21152025112).

The spelling of 21032002100 in words is "twenty-one billion, thirty-two million, two thousand, one hundred".