21144032040 has 64 divisors (see below), whose sum is σ = 63452468160. Its totient is φ = 5636597760.

The previous prime is 21144032023. The next prime is 21144032051. The reversal of 21144032040 is 4023044112.

It is a junction number, because it is equal to n+sod(n) for n = 21144031998 and 21144032016.

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, 370200 + ... + 423480.

It is an arithmetic number, because the mean of its divisors is an integer number (991444815).

Almost surely, 2^21144032040 is an apocalyptic number.

21144032040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21144032040 is an abundant number, since it is smaller than the sum of its proper divisors (42308436120).

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

21144032040 is a wasteful number, since it uses less digits than its factorization.

21144032040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56602 (or 56598 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21144032040 its reverse (4023044112), we get a palindrome (25167076152).

The spelling of 21144032040 in words is "twenty-one billion, one hundred forty-four million, thirty-two thousand, forty".