21040024146 has 16 divisors (see below), whose sum is σ = 43531084800. Its totient is φ = 6771501968.

The previous prime is 21040024139. The next prime is 21040024147. The reversal of 21040024146 is 64142004012.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21040024147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60459666 + ... + 60460013.

It is an arithmetic number, because the mean of its divisors is an integer number (2720692800).

Almost surely, 2^21040024146 is an apocalyptic number.

21040024146 is an abundant number, since it is smaller than the sum of its proper divisors (22491060654).

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

21040024146 is a wasteful number, since it uses less digits than its factorization.

21040024146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120919713.

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

Adding to 21040024146 its reverse (64142004012), we get a palindrome (85182028158).

The spelling of 21040024146 in words is "twenty-one billion, forty million, twenty-four thousand, one hundred forty-six".