21130033540 has 48 divisors (see below), whose sum is σ = 55322273664. Its totient is φ = 6585984000.

The previous prime is 21130033531. The next prime is 21130033609. The reversal of 21130033540 is 4533003112.

It is a Harshad number since it is a multiple of its sum of digits (22).

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, 6858861 + ... + 6861940.

It is an arithmetic number, because the mean of its divisors is an integer number (1152547368).

Almost surely, 2^21130033540 is an apocalyptic number.

21130033540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21130033540 is an abundant number, since it is smaller than the sum of its proper divisors (34192240124).

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

21130033540 is a wasteful number, since it uses less digits than its factorization.

21130033540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13720828 (or 13720826 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

Adding to 21130033540 its reverse (4533003112), we get a palindrome (25663036652).

The spelling of 21130033540 in words is "twenty-one billion, one hundred thirty million, thirty-three thousand, five hundred forty".