21404532450 has 96 divisors (see below), whose sum is σ = 61039236096. Its totient is φ = 4862410560.

The previous prime is 21404532419. The next prime is 21404532467. The reversal of 21404532450 is 5423540412.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 108619 + ... + 233681.

It is an arithmetic number, because the mean of its divisors is an integer number (635825376).

Almost surely, 2^21404532450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21404532450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30519618048).

21404532450 is an abundant number, since it is smaller than the sum of its proper divisors (39634703646).

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

21404532450 is a wasteful number, since it uses less digits than its factorization.

21404532450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125248 (or 125243 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

The spelling of 21404532450 in words is "twenty-one billion, four hundred four million, five hundred thirty-two thousand, four hundred fifty".