21840788355 has 32 divisors (see below), whose sum is σ = 35861736960. Its totient is φ = 11343947520.

The previous prime is 21840788353. The next prime is 21840788393. The reversal of 21840788355 is 55388704812.

It is not a de Polignac number, because 21840788355 - 2¹ = 21840788353 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21840788298 and 21840788307.

It is not an unprimeable number, because it can be changed into a prime (21840788351) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 314706 + ... + 377784.

It is an arithmetic number, because the mean of its divisors is an integer number (1120679280).

Almost surely, 2^21840788355 is an apocalyptic number.

21840788355 is a deficient number, since it is larger than the sum of its proper divisors (14020948605).

21840788355 is a wasteful number, since it uses less digits than its factorization.

21840788355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63691.

The product of its (nonzero) digits is 2150400, while the sum is 51.

The spelling of 21840788355 in words is "twenty-one billion, eight hundred forty million, seven hundred eighty-eight thousand, three hundred fifty-five".