21356750445550 has 96 divisors (see below), whose sum is σ = 44304758313984. Its totient is φ = 7609089264000.

The previous prime is 21356750445529. The next prime is 21356750445553. The reversal of 21356750445550 is 5554405765312.

It is a super-2 number, since 2×21356750445550² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21356750445553) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2754016 + ... + 7092115.

It is an arithmetic number, because the mean of its divisors is an integer number (461507899104).

Almost surely, 2^{21356750445550} is an apocalyptic number.

21356750445550 is an abundant number, since it is smaller than the sum of its proper divisors (22948007868434).

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

21356750445550 is a wasteful number, since it uses less digits than its factorization.

21356750445550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9846274 (or 9846269 counting only the distinct ones).

The product of its (nonzero) digits is 12600000, while the sum is 52.

The spelling of 21356750445550 in words is "twenty-one trillion, three hundred fifty-six billion, seven hundred fifty million, four hundred forty-five thousand, five hundred fifty".