21400311403 has 4 divisors (see below), whose sum is σ = 21568817920. Its totient is φ = 21231804888.

The previous prime is 21400311389. The next prime is 21400311481. The reversal of 21400311403 is 30411300412.

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 21400311403 - 2¹⁷ = 21400180331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21400321403) 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, 84253068 + ... + 84253321.

It is an arithmetic number, because the mean of its divisors is an integer number (5392204480).

Almost surely, 2^21400311403 is an apocalyptic number.

21400311403 is a deficient number, since it is larger than the sum of its proper divisors (168506517).

21400311403 is a wasteful number, since it uses less digits than its factorization.

21400311403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168506516.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21400311403 its reverse (30411300412), we get a palindrome (51811611815).

The spelling of 21400311403 in words is "twenty-one billion, four hundred million, three hundred eleven thousand, four hundred three".