21634113540 has 96 divisors (see below), whose sum is σ = 65260492416. Its totient is φ = 5323253760.

The previous prime is 21634113533. The next prime is 21634113541. The reversal of 21634113540 is 4531143612.

It is a super-2 number, since 2×21634113540² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 21634113498 and 21634113507.

It is not an unprimeable number, because it can be changed into a prime (21634113541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3329695 + ... + 3336185.

It is an arithmetic number, because the mean of its divisors is an integer number (679796796).

Almost surely, 2^21634113540 is an apocalyptic number.

21634113540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21634113540 is an abundant number, since it is smaller than the sum of its proper divisors (43626378876).

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

21634113540 is a wasteful number, since it uses less digits than its factorization.

21634113540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10789 (or 10787 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The spelling of 21634113540 in words is "twenty-one billion, six hundred thirty-four million, one hundred thirteen thousand, five hundred forty".