21121010003 has 8 divisors (see below), whose sum is σ = 21506546880. Its totient is φ = 20738427840.

The previous prime is 21121009909. The next prime is 21121010017. The reversal of 21121010003 is 30001012112.

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

It is a cyclic number.

It is not a de Polignac number, because 21121010003 - 2¹² = 21121005907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121010063) 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 7 ways as a sum of consecutive naturals, for example, 724250 + ... + 752847.

It is an arithmetic number, because the mean of its divisors is an integer number (2688318360).

Almost surely, 2^21121010003 is an apocalyptic number.

21121010003 is a deficient number, since it is larger than the sum of its proper divisors (385536877).

21121010003 is a wasteful number, since it uses less digits than its factorization.

21121010003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1477357.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 21121010003 its reverse (30001012112), we get a palindrome (51122022115).

The spelling of 21121010003 in words is "twenty-one billion, one hundred twenty-one million, ten thousand, three".