21001312103203 has 8 divisors (see below), whose sum is σ = 21006005529600. Its totient is φ = 20996619076680.

The previous prime is 21001312103201. The next prime is 21001312103209. The reversal of 21001312103203 is 30230121310012.

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 21001312103203 - 2¹ = 21001312103201 is a prime.

It is a super-2 number, since 2×21001312103203² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21001312103201) 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, 120889198 + ... + 121062796.

It is an arithmetic number, because the mean of its divisors is an integer number (2625750691200).

Almost surely, 2^{21001312103203} is an apocalyptic number.

21001312103203 is a deficient number, since it is larger than the sum of its proper divisors (4693426397).

21001312103203 is a wasteful number, since it uses less digits than its factorization.

21001312103203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199937.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21001312103203 its reverse (30230121310012), we get a palindrome (51231433413215).

The spelling of 21001312103203 in words is "twenty-one trillion, one billion, three hundred twelve million, one hundred three thousand, two hundred three".