21747072223240 has 128 divisors (see below), whose sum is σ = 60224228064000. Its totient is φ = 6882410861568.

The previous prime is 21747072223213. The next prime is 21747072223273. The reversal of 21747072223240 is 4232227074712.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 253807126 + ... + 253892794.

It is an arithmetic number, because the mean of its divisors is an integer number (470501781750).

Almost surely, 2^{21747072223240} is an apocalyptic number.

21747072223240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21747072223240 is an abundant number, since it is smaller than the sum of its proper divisors (38477155840760).

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

21747072223240 is a wasteful number, since it uses less digits than its factorization.

21747072223240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155439 (or 155435 counting only the distinct ones).

The product of its (nonzero) digits is 526848, while the sum is 43.

Adding to 21747072223240 its reverse (4232227074712), we get a palindrome (25979299297952).

The spelling of 21747072223240 in words is "twenty-one trillion, seven hundred forty-seven billion, seventy-two million, two hundred twenty-three thousand, two hundred forty".