20200011021 has 6 divisors (see below), whose sum is σ = 29177793710. Its totient is φ = 13466674008.

The previous prime is 20200010989. The next prime is 20200011023. The reversal of 20200011021 is 12011000202.

It can be written as a sum of positive squares in only one way, i.e., 20131353225 + 68657796 = 141885^2 + 8286^2 .

It is not a de Polignac number, because 20200011021 - 2⁵ = 20200010989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 2244445669 = 20200011021 / (2 + 0 + 2 + 0 + 0 + 0 + 1 + 1 + 0 + 2 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20200010994 and 20200011012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20200011023) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1122222826 + ... + 1122222843.

Almost surely, 2^20200011021 is an apocalyptic number.

It is an amenable number.

20200011021 is a deficient number, since it is larger than the sum of its proper divisors (8977782689).

20200011021 is a wasteful number, since it uses less digits than its factorization.

20200011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2244445675 (or 2244445672 counting only the distinct ones).

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

Adding to 20200011021 its reverse (12011000202), we get a palindrome (32211011223).

The spelling of 20200011021 in words is "twenty billion, two hundred million, eleven thousand, twenty-one".