21905845833460 has 12 divisors (see below), whose sum is σ = 46002276250308. Its totient is φ = 8762338333376.

The previous prime is 21905845833427. The next prime is 21905845833461. The reversal of 21905845833460 is 6433854850912.

It can be written as a sum of positive squares in 2 ways, for example, as 16696916026596 + 5208929806864 = 4086186^2 + 2282308^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21905845833395 and 21905845833404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21905845833461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 547646145817 + ... + 547646145856.

It is an arithmetic number, because the mean of its divisors is an integer number (3833523020859).

Almost surely, 2^{21905845833460} is an apocalyptic number.

21905845833460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21905845833460 is an abundant number, since it is smaller than the sum of its proper divisors (24096430416848).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21905845833460 is a wasteful number, since it uses less digits than its factorization.

21905845833460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1095292291682 (or 1095292291680 counting only the distinct ones).

The product of its (nonzero) digits is 24883200, while the sum is 58.

The spelling of 21905845833460 in words is "twenty-one trillion, nine hundred five billion, eight hundred forty-five million, eight hundred thirty-three thousand, four hundred sixty".