21240854782 has 16 divisors (see below), whose sum is σ = 38554829280. Its totient is φ = 8567739648.

The previous prime is 21240854777. The next prime is 21240854783. The reversal of 21240854782 is 28745804212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21240854783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44623407 + ... + 44623882.

It is an arithmetic number, because the mean of its divisors is an integer number (2409676830).

Almost surely, 2^21240854782 is an apocalyptic number.

21240854782 is a deficient number, since it is larger than the sum of its proper divisors (17313974498).

21240854782 is a wasteful number, since it uses less digits than its factorization.

21240854782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89247315.

The product of its (nonzero) digits is 286720, while the sum is 43.

The spelling of 21240854782 in words is "twenty-one billion, two hundred forty million, eight hundred fifty-four thousand, seven hundred eighty-two".