21213132435 has 24 divisors (see below), whose sum is σ = 40112105904. Its totient is φ = 10285154880.

The previous prime is 21213132433. The next prime is 21213132443. The reversal of 21213132435 is 53423131212.

21213132435 is a `hidden beast` number, since 2 + 1 + 213 + 13 + 2 + 435 = 666.

It is not a de Polignac number, because 21213132435 - 2¹ = 21213132433 is a prime.

It is a super-3 number, since 3×21213132435³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21213132399 and 21213132408.

It is not an unprimeable number, because it can be changed into a prime (21213132433) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21426912 + ... + 21427901.

It is an arithmetic number, because the mean of its divisors is an integer number (1671337746).

Almost surely, 2^21213132435 is an apocalyptic number.

21213132435 is a deficient number, since it is larger than the sum of its proper divisors (18898973469).

21213132435 is a wasteful number, since it uses less digits than its factorization.

21213132435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42854835 (or 42854832 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

Adding to 21213132435 its reverse (53423131212), we get a palindrome (74636263647).

The spelling of 21213132435 in words is "twenty-one billion, two hundred thirteen million, one hundred thirty-two thousand, four hundred thirty-five".