21450521112 has 32 divisors (see below), whose sum is σ = 53631892800. Its totient is φ = 7149428384.

The previous prime is 21450521101. The next prime is 21450521117. The reversal of 21450521112 is 21112505412.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21450521117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 219463 + ... + 301769.

It is an arithmetic number, because the mean of its divisors is an integer number (1675996650).

Almost surely, 2^21450521112 is an apocalyptic number.

It is an amenable number.

21450521112 is an abundant number, since it is smaller than the sum of its proper divisors (32181371688).

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

21450521112 is a wasteful number, since it uses less digits than its factorization.

21450521112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93175 (or 93171 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 24.

The spelling of 21450521112 in words is "twenty-one billion, four hundred fifty million, five hundred twenty-one thousand, one hundred twelve".