20001102021 has 24 divisors (see below), whose sum is σ = 30608323200. Its totient is φ = 12542161536.

The previous prime is 20001101993. The next prime is 20001102031. The reversal of 20001102021 is 12020110002.

It is not a de Polignac number, because 20001102021 - 2⁶ = 20001101957 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 = 20001101994 and 20001102012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001102031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 221476 + ... + 298418.

It is an arithmetic number, because the mean of its divisors is an integer number (1275346800).

Almost surely, 2^20001102021 is an apocalyptic number.

It is an amenable number.

20001102021 is a deficient number, since it is larger than the sum of its proper divisors (10607221179).

20001102021 is a wasteful number, since it uses less digits than its factorization.

20001102021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78665 (or 78662 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20001102021 its reverse (12020110002), we get a palindrome (32021212023).

The spelling of 20001102021 in words is "twenty billion, one million, one hundred two thousand, twenty-one".