20021323001 has 4 divisors (see below), whose sum is σ = 20021606004. Its totient is φ = 20021040000.

The previous prime is 20021322973. The next prime is 20021323019. The reversal of 20021323001 is 10032312002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 10032312002 = 2 ⋅5016156001.

It can be written as a sum of positive squares in 2 ways, for example, as 9324799225 + 10696523776 = 96565^2 + 103424^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20021323001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20021323801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69101 + ... + 211701.

It is an arithmetic number, because the mean of its divisors is an integer number (5005401501).

Almost surely, 2^20021323001 is an apocalyptic number.

It is an amenable number.

20021323001 is a deficient number, since it is larger than the sum of its proper divisors (283003).

20021323001 is a wasteful number, since it uses less digits than its factorization.

20021323001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283002.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 20021323001 its reverse (10032312002), we get a palindrome (30053635003).

The spelling of 20021323001 in words is "twenty billion, twenty-one million, three hundred twenty-three thousand, one".