20220000021 has 24 divisors (see below), whose sum is σ = 31463446560. Its totient is φ = 12439076256.

The previous prime is 20219999999. The next prime is 20220000079. The reversal of 20220000021 is 12000002202.

It is not a de Polignac number, because 20220000021 - 2⁹ = 20219999509 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 = 20219999958 and 20220000012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20220000721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 360790 + ... + 413048.

It is an arithmetic number, because the mean of its divisors is an integer number (1310976940).

Almost surely, 2^20220000021 is an apocalyptic number.

It is an amenable number.

20220000021 is a deficient number, since it is larger than the sum of its proper divisors (11243446539).

20220000021 is a wasteful number, since it uses less digits than its factorization.

20220000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55585 (or 55582 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

Adding to 20220000021 its reverse (12000002202), we get a palindrome (32220002223).

The spelling of 20220000021 in words is "twenty billion, two hundred twenty million, twenty-one", and thus it is an aban number.