11405421391 has 8 divisors (see below), whose sum is σ = 14037441824. Its totient is φ = 9024069600.

The previous prime is 11405421383. The next prime is 11405421409. The reversal of 11405421391 is 19312450411.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11405421391 - 2³ = 11405421383 is a prime.

It is a super-3 number, since 3×11405421391³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11405421331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62667060 + ... + 62667241.

It is an arithmetic number, because the mean of its divisors is an integer number (1754680228).

Almost surely, 2^11405421391 is an apocalyptic number.

11405421391 is a deficient number, since it is larger than the sum of its proper divisors (2632020433).

11405421391 is a wasteful number, since it uses less digits than its factorization.

11405421391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125334321.

The product of its (nonzero) digits is 4320, while the sum is 31.

The spelling of 11405421391 in words is "eleven billion, four hundred five million, four hundred twenty-one thousand, three hundred ninety-one".