21121020003 has 4 divisors (see below), whose sum is σ = 28161360008. Its totient is φ = 14080680000.

The previous prime is 21121020001. The next prime is 21121020029. The reversal of 21121020003 is 30002012112.

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

It is not a de Polignac number, because 21121020003 - 2¹ = 21121020001 is a prime.

It is a super-2 number, since 2×21121020003² (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 (21121020001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3520169998 + ... + 3520170003.

It is an arithmetic number, because the mean of its divisors is an integer number (7040340002).

Almost surely, 2^21121020003 is an apocalyptic number.

21121020003 is a deficient number, since it is larger than the sum of its proper divisors (7040340005).

21121020003 is an equidigital number, since it uses as much as digits as its factorization.

21121020003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7040340004.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21121020003 its reverse (30002012112), we get a palindrome (51123032115).

The spelling of 21121020003 in words is "twenty-one billion, one hundred twenty-one million, twenty thousand, three".