11534420521 has 12 divisors (see below), whose sum is σ = 12694699020. Its totient is φ = 10472604480.

The previous prime is 11534420519. The next prime is 11534420537. The reversal of 11534420521 is 12502443511.

It can be written as a sum of positive squares in 6 ways, for example, as 7914593296 + 3619827225 = 88964^2 + 60165^2 .

It is not a de Polignac number, because 11534420521 - 2¹ = 11534420519 is a prime.

It is a super-2 number, since 2×11534420521² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11534420521.

It is not an unprimeable number, because it can be changed into a prime (11534420501) 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, 549126 + ... + 569743.

It is an arithmetic number, because the mean of its divisors is an integer number (1057891585).

Almost surely, 2^11534420521 is an apocalyptic number.

It is an amenable number.

11534420521 is a deficient number, since it is larger than the sum of its proper divisors (1160278499).

11534420521 is a wasteful number, since it uses less digits than its factorization.

11534420521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1118956 (or 1118943 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The spelling of 11534420521 in words is "eleven billion, five hundred thirty-four million, four hundred twenty thousand, five hundred twenty-one".