21084801361355 has 4 divisors (see below), whose sum is σ = 25301761633632. Its totient is φ = 16867841089080.

The previous prime is 21084801361249. The next prime is 21084801361369. The reversal of 21084801361355 is 55316310848012.

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

It is not a de Polignac number, because 21084801361355 - 2²² = 21084797167051 is a prime.

It is a super-2 number, since 2×21084801361355² (a number of 27 digits) contains 22 as substring.

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, 2108480136131 + ... + 2108480136140.

It is an arithmetic number, because the mean of its divisors is an integer number (6325440408408).

Almost surely, 2^{21084801361355} is an apocalyptic number.

21084801361355 is a deficient number, since it is larger than the sum of its proper divisors (4216960272277).

21084801361355 is an equidigital number, since it uses as much as digits as its factorization.

21084801361355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4216960272276.

The product of its (nonzero) digits is 691200, while the sum is 47.

The spelling of 21084801361355 in words is "twenty-one trillion, eighty-four billion, eight hundred one million, three hundred sixty-one thousand, three hundred fifty-five".