21021231003 has 8 divisors (see below), whose sum is σ = 28028986368. Its totient is φ = 14013814824.

The previous prime is 21021230981. The next prime is 21021231013. The reversal of 21021231003 is 30013212012.

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

It is not a de Polignac number, because 21021231003 - 2⁶ = 21021230939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21021231013) 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, 164626 + ... + 262952.

It is an arithmetic number, because the mean of its divisors is an integer number (3503623296).

Almost surely, 2^21021231003 is an apocalyptic number.

21021231003 is a deficient number, since it is larger than the sum of its proper divisors (7007755365).

21021231003 is an equidigital number, since it uses as much as digits as its factorization.

21021231003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169593.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21021231003 its reverse (30013212012), we get a palindrome (51034443015).

The spelling of 21021231003 in words is "twenty-one billion, twenty-one million, two hundred thirty-one thousand, three".