21345441450 has 48 divisors (see below), whose sum is σ = 52971359616. Its totient is φ = 5688390400.

The previous prime is 21345441427. The next prime is 21345441473. The reversal of 21345441450 is 5414454312.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21345441427) and next prime (21345441473).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 187135 + ... + 278765.

It is an arithmetic number, because the mean of its divisors is an integer number (1103569992).

Almost surely, 2^21345441450 is an apocalyptic number.

21345441450 is an abundant number, since it is smaller than the sum of its proper divisors (31625918166).

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

21345441450 is a wasteful number, since it uses less digits than its factorization.

21345441450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93199 (or 93194 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 33.

Adding to 21345441450 its reverse (5414454312), we get a palindrome (26759895762).

The spelling of 21345441450 in words is "twenty-one billion, three hundred forty-five million, four hundred forty-one thousand, four hundred fifty".