11403131421 has 24 divisors (see below), whose sum is σ = 16639897824. Its totient is φ = 6888757440.

The previous prime is 11403131407. The next prime is 11403131449. The reversal of 11403131421 is 12413130411.

It is not a de Polignac number, because 11403131421 - 2¹⁸ = 11402869277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11403131461) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4018015 + ... + 4020851.

It is an arithmetic number, because the mean of its divisors is an integer number (693329076).

Almost surely, 2^11403131421 is an apocalyptic number.

11403131421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11403131421 is a deficient number, since it is larger than the sum of its proper divisors (5236766403).

11403131421 is an equidigital number, since it uses as much as digits as its factorization.

11403131421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3549 (or 3200 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 11403131421 its reverse (12413130411), we get a palindrome (23816261832).

The spelling of 11403131421 in words is "eleven billion, four hundred three million, one hundred thirty-one thousand, four hundred twenty-one".