11401913821 has 12 divisors (see below), whose sum is σ = 12439432468. Its totient is φ = 10441170432.

The previous prime is 11401913771. The next prime is 11401913827. The reversal of 11401913821 is 12831910411.

It can be written as a sum of positive squares in 6 ways, for example, as 2183225625 + 9218688196 = 46725^2 + 96014^2 .

It is not a de Polignac number, because 11401913821 - 2⁷ = 11401913693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11401913827) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 522456 + ... + 543841.

Almost surely, 2^11401913821 is an apocalyptic number.

It is an amenable number.

11401913821 is a deficient number, since it is larger than the sum of its proper divisors (1037518647).

11401913821 is a wasteful number, since it uses less digits than its factorization.

11401913821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1066368 (or 1066351 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 31.

The spelling of 11401913821 in words is "eleven billion, four hundred one million, nine hundred thirteen thousand, eight hundred twenty-one".