21354235355 has 4 divisors (see below), whose sum is σ = 25625082432. Its totient is φ = 17083388280.

The previous prime is 21354235349. The next prime is 21354235361. The reversal of 21354235355 is 55353245312.

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

It is an interprime number because it is at equal distance from previous prime (21354235349) and next prime (21354235361).

It is not a de Polignac number, because 21354235355 - 2⁸ = 21354235099 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, 2135423531 + ... + 2135423540.

It is an arithmetic number, because the mean of its divisors is an integer number (6406270608).

Almost surely, 2^21354235355 is an apocalyptic number.

21354235355 is a deficient number, since it is larger than the sum of its proper divisors (4270847077).

21354235355 is an equidigital number, since it uses as much as digits as its factorization.

21354235355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4270847076.

The product of its digits is 270000, while the sum is 38.

The spelling of 21354235355 in words is "twenty-one billion, three hundred fifty-four million, two hundred thirty-five thousand, three hundred fifty-five".