21424005040 has 40 divisors (see below), whose sum is σ = 51976503648. Its totient is φ = 8197009920.

The previous prime is 21424005037. The next prime is 21424005061. The reversal of 21424005040 is 4050042412.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5819901 + ... + 5823580.

Almost surely, 2^21424005040 is an apocalyptic number.

21424005040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21424005040 is an abundant number, since it is smaller than the sum of its proper divisors (30552498608).

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

21424005040 is a wasteful number, since it uses less digits than its factorization.

21424005040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11643517 (or 11643511 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 22.

Adding to 21424005040 its reverse (4050042412), we get a palindrome (25474047452).

The spelling of 21424005040 in words is "twenty-one billion, four hundred twenty-four million, five thousand, forty".