21355353047377 has 16 divisors (see below), whose sum is σ = 23349695330304. Its totient is φ = 19443512448000.

The previous prime is 21355353047363. The next prime is 21355353047401. The reversal of 21355353047377 is 77374035355312.

It is a de Polignac number, because none of the positive numbers 2^k-21355353047377 is a prime.

It is a super-2 number, since 2×21355353047377² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21355353027377) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6178024 + ... + 8993257.

It is an arithmetic number, because the mean of its divisors is an integer number (1459355958144).

Almost surely, 2^{21355353047377} is an apocalyptic number.

It is an amenable number.

21355353047377 is a deficient number, since it is larger than the sum of its proper divisors (1994342282927).

21355353047377 is a wasteful number, since it uses less digits than its factorization.

21355353047377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15174000.

The product of its (nonzero) digits is 27783000, while the sum is 55.

The spelling of 21355353047377 in words is "twenty-one trillion, three hundred fifty-five billion, three hundred fifty-three million, forty-seven thousand, three hundred seventy-seven".