21763040 has 48 divisors (see below), whose sum is σ = 55375488. Its totient is φ = 8034816.

The previous prime is 21763039. The next prime is 21763061. The reversal of 21763040 is 4036712.

It is a junction number, because it is equal to n+sod(n) for n = 21762997 and 21763015.

It is a congruent number.

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, 3152 + ... + 7311.

It is an arithmetic number, because the mean of its divisors is an integer number (1153656).

Almost surely, 2^21763040 is an apocalyptic number.

21763040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21763040 is an abundant number, since it is smaller than the sum of its proper divisors (33612448).

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

21763040 is a wasteful number, since it uses less digits than its factorization.

21763040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10491 (or 10483 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 21763040 is about 4665.0873518081. The cubic root of 21763040 is about 279.1942823601.

Adding to 21763040 its reverse (4036712), we get a palindrome (25799752).

The spelling of 21763040 in words is "twenty-one million, seven hundred sixty-three thousand, forty".