11528678421 has 12 divisors (see below), whose sum is σ = 17933499948. Its totient is φ = 7094571264.

The previous prime is 11528678419. The next prime is 11528678429. The reversal of 11528678421 is 12487682511.

11528678421 is a `hidden beast` number, since 1 + 152 + 8 + 6 + 78 + 421 = 666.

11528678421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 1437471396 + 10091207025 = 37914^2 + 100455^2 .

It is not a de Polignac number, because 11528678421 - 2¹ = 11528678419 is a prime.

It is a super-2 number, since 2×11528678421² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11528678429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49267740 + ... + 49267973.

It is an arithmetic number, because the mean of its divisors is an integer number (1494458329).

Almost surely, 2^11528678421 is an apocalyptic number.

It is an amenable number.

11528678421 is a deficient number, since it is larger than the sum of its proper divisors (6404821527).

11528678421 is a wasteful number, since it uses less digits than its factorization.

11528678421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98535732 (or 98535729 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The spelling of 11528678421 in words is "eleven billion, five hundred twenty-eight million, six hundred seventy-eight thousand, four hundred twenty-one".