21024112240 has 40 divisors (see below), whose sum is σ = 49610641680. Its totient is φ = 8284125696.

The previous prime is 21024112171. The next prime is 21024112259. The reversal of 21024112240 is 4221142012.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1955845 + ... + 1966564.

It is an arithmetic number, because the mean of its divisors is an integer number (1240266042).

Almost surely, 2^21024112240 is an apocalyptic number.

21024112240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21024112240 is an abundant number, since it is smaller than the sum of its proper divisors (28586529440).

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

21024112240 is a wasteful number, since it uses less digits than its factorization.

21024112240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3922489 (or 3922483 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21024112240 its reverse (4221142012), we get a palindrome (25245254252).

The spelling of 21024112240 in words is "twenty-one billion, twenty-four million, one hundred twelve thousand, two hundred forty".