20331221003 has 4 divisors (see below), whose sum is σ = 20477488920. Its totient is φ = 20184953088.

The previous prime is 20331220951. The next prime is 20331221039. The reversal of 20331221003 is 30012213302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20331221003 - 2²⁶ = 20264112139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20331221203) 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, 73133750 + ... + 73134027.

It is an arithmetic number, because the mean of its divisors is an integer number (5119372230).

Almost surely, 2^20331221003 is an apocalyptic number.

20331221003 is a deficient number, since it is larger than the sum of its proper divisors (146267917).

20331221003 is a wasteful number, since it uses less digits than its factorization.

20331221003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146267916.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 20331221003 its reverse (30012213302), we get a palindrome (50343434305).

The spelling of 20331221003 in words is "twenty billion, three hundred thirty-one million, two hundred twenty-one thousand, three".