11403420321 has 4 divisors (see below), whose sum is σ = 15204560432. Its totient is φ = 7602280212.

The previous prime is 11403420311. The next prime is 11403420331. The reversal of 11403420321 is 12302430411.

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 an interprime number because it is at equal distance from previous prime (11403420311) and next prime (11403420331).

It is not a de Polignac number, because 11403420321 - 2¹³ = 11403412129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11403420311) 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, 1900570051 + ... + 1900570056.

It is an arithmetic number, because the mean of its divisors is an integer number (3801140108).

Almost surely, 2^11403420321 is an apocalyptic number.

It is an amenable number.

11403420321 is a deficient number, since it is larger than the sum of its proper divisors (3801140111).

11403420321 is an equidigital number, since it uses as much as digits as its factorization.

11403420321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3801140110.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 11403420321 its reverse (12302430411), we get a palindrome (23705850732).

The spelling of 11403420321 in words is "eleven billion, four hundred three million, four hundred twenty thousand, three hundred twenty-one".