20218206021 has 16 divisors (see below), whose sum is σ = 29097425280. Its totient is φ = 12413620800.

The previous prime is 20218205951. The next prime is 20218206031. The reversal of 20218206021 is 12060281202.

It is not a de Polignac number, because 20218206021 - 2⁹ = 20218205509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20218205982 and 20218206000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20218206031) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 573330 + ... + 607571.

It is an arithmetic number, because the mean of its divisors is an integer number (1818589080).

Almost surely, 2^20218206021 is an apocalyptic number.

It is an amenable number.

20218206021 is a deficient number, since it is larger than the sum of its proper divisors (8879219259).

20218206021 is a wasteful number, since it uses less digits than its factorization.

20218206021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1181356.

The product of its (nonzero) digits is 768, while the sum is 24.

Adding to 20218206021 its reverse (12060281202), we get a palindrome (32278487223).

The spelling of 20218206021 in words is "twenty billion, two hundred eighteen million, two hundred six thousand, twenty-one".