21532004235 has 48 divisors (see below), whose sum is σ = 43694239680. Its totient is φ = 9603118080.

The previous prime is 21532004233. The next prime is 21532004237. The reversal of 21532004235 is 53240023512.

It is a happy number.

21532004235 is a `hidden beast` number, since 215 + 3 + 20 + 0 + 423 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (21532004233) and next prime (21532004237).

It is not a de Polignac number, because 21532004235 - 2¹ = 21532004233 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21532004199 and 21532004208.

It is not an unprimeable number, because it can be changed into a prime (21532004233) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 820690 + ... + 846519.

It is an arithmetic number, because the mean of its divisors is an integer number (910296660).

Almost surely, 2^21532004235 is an apocalyptic number.

21532004235 is an abundant number, since it is smaller than the sum of its proper divisors (22162235445).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21532004235 is a wasteful number, since it uses less digits than its factorization.

21532004235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1667268 (or 1667265 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

Adding to 21532004235 its reverse (53240023512), we get a palindrome (74772027747).

The spelling of 21532004235 in words is "twenty-one billion, five hundred thirty-two million, four thousand, two hundred thirty-five".