21004314355 has 4 divisors (see below), whose sum is σ = 25205177232. Its totient is φ = 16803451480.

The previous prime is 21004314347. The next prime is 21004314467. The reversal of 21004314355 is 55341340012.

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

It is not a de Polignac number, because 21004314355 - 2³ = 21004314347 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, 2100431431 + ... + 2100431440.

It is an arithmetic number, because the mean of its divisors is an integer number (6301294308).

Almost surely, 2^21004314355 is an apocalyptic number.

21004314355 is a deficient number, since it is larger than the sum of its proper divisors (4200862877).

21004314355 is an equidigital number, since it uses as much as digits as its factorization.

21004314355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4200862876.

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 21004314355 its reverse (55341340012), we get a palindrome (76345654367).

The spelling of 21004314355 in words is "twenty-one billion, four million, three hundred fourteen thousand, three hundred fifty-five".