20220021021 has 8 divisors (see below), whose sum is σ = 27587005600. Its totient is φ = 13166525232.

The previous prime is 20220020999. The next prime is 20220021061. The reversal of 20220021021 is 12012002202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20220021021 - 2¹³ = 20220012829 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20220020988 and 20220021006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20220021061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78372046 + ... + 78372303.

It is an arithmetic number, because the mean of its divisors is an integer number (3448375700).

Almost surely, 2^20220021021 is an apocalyptic number.

It is an amenable number.

20220021021 is a deficient number, since it is larger than the sum of its proper divisors (7366984579).

20220021021 is a wasteful number, since it uses less digits than its factorization.

20220021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156744395.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 20220021021 its reverse (12012002202), we get a palindrome (32232023223).

The spelling of 20220021021 in words is "twenty billion, two hundred twenty million, twenty-one thousand, twenty-one".