21003111401 has 4 divisors (see below), whose sum is σ = 21359096400. Its totient is φ = 20647126404.

The previous prime is 21003111379. The next prime is 21003111421. The reversal of 21003111401 is 10411130012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21003111401 is a prime.

It is a super-3 number, since 3×21003111401³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21003111421) 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, 177992411 + ... + 177992528.

It is an arithmetic number, because the mean of its divisors is an integer number (5339774100).

Almost surely, 2^21003111401 is an apocalyptic number.

It is an amenable number.

21003111401 is a deficient number, since it is larger than the sum of its proper divisors (355984999).

21003111401 is an equidigital number, since it uses as much as digits as its factorization.

21003111401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355984998.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21003111401 its reverse (10411130012), we get a palindrome (31414241413).

The spelling of 21003111401 in words is "twenty-one billion, three million, one hundred eleven thousand, four hundred one".