21253341235 has 16 divisors (see below), whose sum is σ = 29149869312. Its totient is φ = 14572504800.

The previous prime is 21253341217. The next prime is 21253341247. The reversal of 21253341235 is 53214335212.

It is not a de Polignac number, because 21253341235 - 2¹¹ = 21253339187 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21253341197 and 21253341206.

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, 668040 + ... + 699130.

It is an arithmetic number, because the mean of its divisors is an integer number (1821866832).

Almost surely, 2^21253341235 is an apocalyptic number.

21253341235 is a deficient number, since it is larger than the sum of its proper divisors (7896528077).

21253341235 is a wasteful number, since it uses less digits than its factorization.

21253341235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50634.

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

Adding to 21253341235 its reverse (53214335212), we get a palindrome (74467676447).

The spelling of 21253341235 in words is "twenty-one billion, two hundred fifty-three million, three hundred forty-one thousand, two hundred thirty-five".