21534421123235 has 4 divisors (see below), whose sum is σ = 25841305347888. Its totient is φ = 17227536898584.

The previous prime is 21534421123129. The next prime is 21534421123261. The reversal of 21534421123235 is 53232112443512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21534421123235 - 2⁸ = 21534421122979 is a prime.

It is a super-2 number, since 2×21534421123235² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2153442112319 + ... + 2153442112328.

It is an arithmetic number, because the mean of its divisors is an integer number (6460326336972).

Almost surely, 2^{21534421123235} is an apocalyptic number.

21534421123235 is a deficient number, since it is larger than the sum of its proper divisors (4306884224653).

21534421123235 is an equidigital number, since it uses as much as digits as its factorization.

21534421123235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4306884224652.

The product of its digits is 172800, while the sum is 38.

Adding to 21534421123235 its reverse (53232112443512), we get a palindrome (74766533566747).

The spelling of 21534421123235 in words is "twenty-one trillion, five hundred thirty-four billion, four hundred twenty-one million, one hundred twenty-three thousand, two hundred thirty-five".