21011021031003 has 4 divisors (see below), whose sum is σ = 28014694708008. Its totient is φ = 14007347354000.

The previous prime is 21011021030971. The next prime is 21011021031043. The reversal of 21011021031003 is 30013012011012.

It is a happy number.

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 21011021031003 - 2⁵ = 21011021030971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21011021031043) 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, 3501836838498 + ... + 3501836838503.

It is an arithmetic number, because the mean of its divisors is an integer number (7003673677002).

Almost surely, 2^{21011021031003} is an apocalyptic number.

21011021031003 is a deficient number, since it is larger than the sum of its proper divisors (7003673677005).

21011021031003 is an equidigital number, since it uses as much as digits as its factorization.

21011021031003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7003673677004.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21011021031003 its reverse (30013012011012), we get a palindrome (51024033042015).

The spelling of 21011021031003 in words is "twenty-one trillion, eleven billion, twenty-one million, thirty-one thousand, three".