21240666244 has 48 divisors (see below), whose sum is σ = 44349596928. Its totient is φ = 8703180288.

The previous prime is 21240666241. The next prime is 21240666253. The reversal of 21240666244 is 44266604212.

It is not an unprimeable number, because it can be changed into a prime (21240666241) 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, 1585944 + ... + 1599280.

It is an arithmetic number, because the mean of its divisors is an integer number (923949936).

Almost surely, 2^21240666244 is an apocalyptic number.

It is an amenable number.

21240666244 is an abundant number, since it is smaller than the sum of its proper divisors (23108930684).

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

21240666244 is a wasteful number, since it uses less digits than its factorization.

21240666244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15844 (or 15842 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 37.

The spelling of 21240666244 in words is "twenty-one billion, two hundred forty million, six hundred sixty-six thousand, two hundred forty-four".