21024210440 has 32 divisors (see below), whose sum is σ = 47970740160. Its totient is φ = 8291236800.

The previous prime is 21024210419. The next prime is 21024210463. The reversal of 21024210440 is 4401242012.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 3698606 + ... + 3704285.

It is an arithmetic number, because the mean of its divisors is an integer number (1499085630).

Almost surely, 2^21024210440 is an apocalyptic number.

21024210440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21024210440 is an abundant number, since it is smaller than the sum of its proper divisors (26946529720).

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

21024210440 is a wasteful number, since it uses less digits than its factorization.

21024210440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7402973 (or 7402969 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21024210440 its reverse (4401242012), we get a palindrome (25425452452).

The spelling of 21024210440 in words is "twenty-one billion, twenty-four million, two hundred ten thousand, four hundred forty".