21031020003 has 8 divisors (see below), whose sum is σ = 32047268608. Its totient is φ = 12017725704.

The previous prime is 21031019981. The next prime is 21031020037. The reversal of 21031020003 is 30002013012.

It is a happy number.

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

It is not a de Polignac number, because 21031020003 - 2⁶ = 21031019939 is a prime.

It is a super-2 number, since 2×21031020003² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21031028003) 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, 500738551 + ... + 500738592.

It is an arithmetic number, because the mean of its divisors is an integer number (4005908576).

Almost surely, 2^21031020003 is an apocalyptic number.

21031020003 is a deficient number, since it is larger than the sum of its proper divisors (11016248605).

21031020003 is a wasteful number, since it uses less digits than its factorization.

21031020003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001477153.

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 21031020003 its reverse (30002013012), we get a palindrome (51033033015).

The spelling of 21031020003 in words is "twenty-one billion, thirty-one million, twenty thousand, three".