21454421450 has 96 divisors (see below), whose sum is σ = 50453342208. Its totient is φ = 6592824000.

The previous prime is 21454421431. The next prime is 21454421489. The reversal of 21454421450 is 5412445412.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 234107 + ... + 312593.

It is an arithmetic number, because the mean of its divisors is an integer number (525555648).

Almost surely, 2^21454421450 is an apocalyptic number.

21454421450 is an abundant number, since it is smaller than the sum of its proper divisors (28998920758).

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

21454421450 is a wasteful number, since it uses less digits than its factorization.

21454421450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78588 (or 78583 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 32.

Adding to 21454421450 its reverse (5412445412), we get a palindrome (26866866862).

The spelling of 21454421450 in words is "twenty-one billion, four hundred fifty-four million, four hundred twenty-one thousand, four hundred fifty".