21235133255 has 16 divisors (see below), whose sum is σ = 29290814784. Its totient is φ = 14477061120.

The previous prime is 21235133243. The next prime is 21235133261. The reversal of 21235133255 is 55233153212.

It is not a de Polignac number, because 21235133255 - 2¹⁴ = 21235116871 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1747466 + ... + 1759575.

It is an arithmetic number, because the mean of its divisors is an integer number (1830675924).

Almost surely, 2^21235133255 is an apocalyptic number.

21235133255 is a deficient number, since it is larger than the sum of its proper divisors (8055681529).

21235133255 is a wasteful number, since it uses less digits than its factorization.

21235133255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3507226.

The product of its digits is 27000, while the sum is 32.

Adding to 21235133255 its reverse (55233153212), we get a palindrome (76468286467).

The spelling of 21235133255 in words is "twenty-one billion, two hundred thirty-five million, one hundred thirty-three thousand, two hundred fifty-five".