20022100021 has 12 divisors (see below), whose sum is σ = 25151730016. Its totient is φ = 15601635720.

The previous prime is 20022100009. The next prime is 20022100057. The reversal of 20022100021 is 12000122002.

It is not a de Polignac number, because 20022100021 - 2¹⁷ = 20021968949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20022099980 and 20022100007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20022100061) 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 11 ways as a sum of consecutive naturals, for example, 11818575 + ... + 11820268.

Almost surely, 2^20022100021 is an apocalyptic number.

It is an amenable number.

20022100021 is a deficient number, since it is larger than the sum of its proper divisors (5129629995).

20022100021 is a wasteful number, since it uses less digits than its factorization.

20022100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23638872 (or 23638861 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 20022100021 its reverse (12000122002), we get a palindrome (32022222023).

The spelling of 20022100021 in words is "twenty billion, twenty-two million, one hundred thousand, twenty-one".