21116204444536 has 128 divisors (see below), whose sum is σ = 43673012248320. Its totient is φ = 9530357760000.

The previous prime is 21116204444513. The next prime is 21116204444537. The reversal of 21116204444536 is 63544440261112.

It is a junction number, because it is equal to n+sod(n) for n = 21116204444492 and 21116204444501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21116204444537) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 636377866 + ... + 636411046.

It is an arithmetic number, because the mean of its divisors is an integer number (341195408190).

Almost surely, 2^{21116204444536} is an apocalyptic number.

It is an amenable number.

21116204444536 is an abundant number, since it is smaller than the sum of its proper divisors (22556807803784).

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

21116204444536 is a wasteful number, since it uses less digits than its factorization.

21116204444536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35177 (or 35173 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 43.

The spelling of 21116204444536 in words is "twenty-one trillion, one hundred sixteen billion, two hundred four million, four hundred forty-four thousand, five hundred thirty-six".