21116204444540 has 48 divisors (see below), whose sum is σ = 44978445033984. Its totient is φ = 8326494696000.

The previous prime is 21116204444537. The next prime is 21116204444603. The reversal of 21116204444540 is 4544440261112.

It is a super-2 number, since 2×21116204444540² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21116204444494 and 21116204444503.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26291864 + ... + 27083103.

It is an arithmetic number, because the mean of its divisors is an integer number (937050938208).

Almost surely, 2^{21116204444540} is an apocalyptic number.

21116204444540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21116204444540 is an abundant number, since it is smaller than the sum of its proper divisors (23862240589444).

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

21116204444540 is a wasteful number, since it uses less digits than its factorization.

21116204444540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53375258 (or 53375256 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 38.

The spelling of 21116204444540 in words is "twenty-one trillion, one hundred sixteen billion, two hundred four million, four hundred forty-four thousand, five hundred forty".