21120383760 has 120 divisors (see below), whose sum is σ = 76162732416. Its totient is φ = 4827513600.

The previous prime is 21120383699. The next prime is 21120383761. The reversal of 21120383760 is 6738302112.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×21120383760² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21120383761) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 886216 + ... + 909735.

Almost surely, 2^21120383760 is an apocalyptic number.

21120383760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120383760 is an abundant number, since it is smaller than the sum of its proper divisors (55042348656).

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

21120383760 is a wasteful number, since it uses less digits than its factorization.

21120383760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1795981 (or 1795968 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

Adding to 21120383760 its reverse (6738302112), we get a palindrome (27858685872).

The spelling of 21120383760 in words is "twenty-one billion, one hundred twenty million, three hundred eighty-three thousand, seven hundred sixty".