21113442240 has 112 divisors (see below), whose sum is σ = 73129322880. Its totient is φ = 5118407680.

The previous prime is 21113442239. The next prime is 21113442307. The reversal of 21113442240 is 4224431112.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 21113442240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 989130 + ... + 1010249.

Almost surely, 2^21113442240 is an apocalyptic number.

21113442240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21113442240 is an abundant number, since it is smaller than the sum of its proper divisors (52015880640).

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

21113442240 is a wasteful number, since it uses less digits than its factorization.

21113442240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1999410 (or 1999400 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21113442240 its reverse (4224431112), we get a palindrome (25337873352).

The spelling of 21113442240 in words is "twenty-one billion, one hundred thirteen million, four hundred forty-two thousand, two hundred forty".