21013031003 has 2 divisors, whose sum is σ = 21013031004. Its totient is φ = 21013031002.

The previous prime is 21013030967. The next prime is 21013031023. The reversal of 21013031003 is 30013031012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21013031003 - 2⁶ = 21013030939 is a prime.

It is not a weakly prime, because it can be changed into another prime (21013031023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506515501 + 10506515502.

It is an arithmetic number, because the mean of its divisors is an integer number (10506515502).

Almost surely, 2^21013031003 is an apocalyptic number.

21013031003 is a deficient number, since it is larger than the sum of its proper divisors (1).

21013031003 is an equidigital number, since it uses as much as digits as its factorization.

21013031003 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 14.

Adding to 21013031003 its reverse (30013031012), we get a palindrome (51026062015).

Subtracting 21013031003 from its reverse (30013031012), we obtain a palindrome (9000000009).

The spelling of 21013031003 in words is "twenty-one billion, thirteen million, thirty-one thousand, three".