20030100021 has 36 divisors (see below), whose sum is σ = 29403858432. Its totient is φ = 13138442352.

The previous prime is 20030100011. The next prime is 20030100023. The reversal of 20030100021 is 12000103002.

It is a happy number.

It is not a de Polignac number, because 20030100021 - 2⁵ = 20030099989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 20030099976 and 20030100012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20030100023) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 22083450 + ... + 22084356.

Almost surely, 2^20030100021 is an apocalyptic number.

It is an amenable number.

20030100021 is a deficient number, since it is larger than the sum of its proper divisors (9373758411).

20030100021 is a wasteful number, since it uses less digits than its factorization.

20030100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1318 (or 1176 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

Adding to 20030100021 its reverse (12000103002), we get a palindrome (32030203023).

The spelling of 20030100021 in words is "twenty billion, thirty million, one hundred thousand, twenty-one".