21130041040 has 40 divisors (see below), whose sum is σ = 49133406600. Its totient is φ = 8450973696.

The previous prime is 21130040977. The next prime is 21130041059. The reversal of 21130041040 is 4014003112.

It can be written as a sum of positive squares in 4 ways, for example, as 9387284544 + 11742756496 = 96888^2 + 108364^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1202236 + ... + 1219684.

It is an arithmetic number, because the mean of its divisors is an integer number (1228335165).

Almost surely, 2^21130041040 is an apocalyptic number.

21130041040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21130041040 is an abundant number, since it is smaller than the sum of its proper divisors (28003365560).

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

21130041040 is a wasteful number, since it uses less digits than its factorization.

21130041040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32599 (or 32593 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21130041040 its reverse (4014003112), we get a palindrome (25144044152).

The spelling of 21130041040 in words is "twenty-one billion, one hundred thirty million, forty-one thousand, forty".