21013454450 has 48 divisors (see below), whose sum is σ = 39819076416. Its totient is φ = 8248872000.

The previous prime is 21013454443. The next prime is 21013454459. The reversal of 21013454450 is 5445431012.

It is not an unprimeable number, because it can be changed into a prime (21013454459) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 609884 + ... + 643416.

It is an arithmetic number, because the mean of its divisors is an integer number (829564092).

Almost surely, 2^21013454450 is an apocalyptic number.

21013454450 is a deficient number, since it is larger than the sum of its proper divisors (18805621966).

21013454450 is a wasteful number, since it uses less digits than its factorization.

21013454450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33779 (or 33774 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

Adding to 21013454450 its reverse (5445431012), we get a palindrome (26458885462).

The spelling of 21013454450 in words is "twenty-one billion, thirteen million, four hundred fifty-four thousand, four hundred fifty".