20001322021 has 24 divisors (see below), whose sum is σ = 21618087680. Its totient is φ = 18453655872.

The previous prime is 20001322013. The next prime is 20001322037. The reversal of 20001322021 is 12022310002.

It is not a de Polignac number, because 20001322021 - 2³ = 20001322013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20001321992 and 20001322010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001322921) 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, 9358465 + ... + 9360601.

Almost surely, 2^20001322021 is an apocalyptic number.

It is an amenable number.

20001322021 is a deficient number, since it is larger than the sum of its proper divisors (1616765659).

20001322021 is a wasteful number, since it uses less digits than its factorization.

20001322021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2473 (or 2426 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 20001322021 its reverse (12022310002), we get a palindrome (32023632023).

The spelling of 20001322021 in words is "twenty billion, one million, three hundred twenty-two thousand, twenty-one".