21011130240 has 128 divisors (see below), whose sum is σ = 70497993600. Its totient is φ = 5308065792.

The previous prime is 21011130211. The next prime is 21011130241. The reversal of 21011130240 is 4203111012.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011130241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 251502 + ... + 324461.

It is an arithmetic number, because the mean of its divisors is an integer number (550765575).

Almost surely, 2^21011130240 is an apocalyptic number.

21011130240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011130240 is an abundant number, since it is smaller than the sum of its proper divisors (49486863360).

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

21011130240 is a wasteful number, since it uses less digits than its factorization.

21011130240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576004 (or 575992 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21011130240 its reverse (4203111012), we get a palindrome (25214241252).

The spelling of 21011130240 in words is "twenty-one billion, eleven million, one hundred thirty thousand, two hundred forty".