21123542335 has 32 divisors (see below), whose sum is σ = 29249372160. Its totient is φ = 14345154432.

The previous prime is 21123542333. The next prime is 21123542369. The reversal of 21123542335 is 53324532112.

It is not a de Polignac number, because 21123542335 - 2¹ = 21123542333 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21123542297 and 21123542306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123542333) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2694201 + ... + 2702029.

It is an arithmetic number, because the mean of its divisors is an integer number (914042880).

Almost surely, 2^21123542335 is an apocalyptic number.

21123542335 is a deficient number, since it is larger than the sum of its proper divisors (8125829825).

21123542335 is a wasteful number, since it uses less digits than its factorization.

21123542335 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8575.

The product of its digits is 21600, while the sum is 31.

The spelling of 21123542335 in words is "twenty-one billion, one hundred twenty-three million, five hundred forty-two thousand, three hundred thirty-five".