21402303355 has 8 divisors (see below), whose sum is σ = 26280037872. Its totient is φ = 16723660128.

The previous prime is 21402303313. The next prime is 21402303371. The reversal of 21402303355 is 55330320412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21402303355 - 2¹⁵ = 21402270587 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49772584 + ... + 49773013.

It is an arithmetic number, because the mean of its divisors is an integer number (3285004734).

Almost surely, 2^21402303355 is an apocalyptic number.

21402303355 is a deficient number, since it is larger than the sum of its proper divisors (4877734517).

21402303355 is an equidigital number, since it uses as much as digits as its factorization.

21402303355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99545645.

The product of its (nonzero) digits is 10800, while the sum is 28.

Adding to 21402303355 its reverse (55330320412), we get a palindrome (76732623767).

The spelling of 21402303355 in words is "twenty-one billion, four hundred two million, three hundred three thousand, three hundred fifty-five".