21424212235 has 4 divisors (see below), whose sum is σ = 25709054688. Its totient is φ = 17139369784.

The previous prime is 21424212193. The next prime is 21424212259. The reversal of 21424212235 is 53221242412.

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 21424212235 - 2⁹ = 21424211723 is a prime.

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, 2142421219 + ... + 2142421228.

It is an arithmetic number, because the mean of its divisors is an integer number (6427263672).

Almost surely, 2^21424212235 is an apocalyptic number.

21424212235 is a deficient number, since it is larger than the sum of its proper divisors (4284842453).

21424212235 is an equidigital number, since it uses as much as digits as its factorization.

21424212235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4284842452.

The product of its digits is 7680, while the sum is 28.

Adding to 21424212235 its reverse (53221242412), we get a palindrome (74645454647).

The spelling of 21424212235 in words is "twenty-one billion, four hundred twenty-four million, two hundred twelve thousand, two hundred thirty-five".