21140400403 has 4 divisors (see below), whose sum is σ = 21193120008. Its totient is φ = 21087680800.

The previous prime is 21140400383. The next prime is 21140400409. The reversal of 21140400403 is 30400404112.

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 21140400403 - 2¹⁷ = 21140269331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21140400409) 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, 26359201 + ... + 26360002.

It is an arithmetic number, because the mean of its divisors is an integer number (5298280002).

Almost surely, 2^21140400403 is an apocalyptic number.

21140400403 is a deficient number, since it is larger than the sum of its proper divisors (52719605).

21140400403 is an equidigital number, since it uses as much as digits as its factorization.

21140400403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52719604.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21140400403 its reverse (30400404112), we get a palindrome (51540804515).

The spelling of 21140400403 in words is "twenty-one billion, one hundred forty million, four hundred thousand, four hundred three".