21445553430 has 48 divisors (see below), whose sum is σ = 63723932064. Its totient is φ = 4901840640.

The previous prime is 21445553413. The next prime is 21445553491. The reversal of 21445553430 is 3435554412.

21445553430 is a `hidden beast` number, since 2 + 1 + 44 + 55 + 534 + 30 = 666.

It is a congruent number.

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, 17019651 + ... + 17020910.

It is an arithmetic number, because the mean of its divisors is an integer number (1327581918).

Almost surely, 2^21445553430 is an apocalyptic number.

21445553430 is an abundant number, since it is smaller than the sum of its proper divisors (42278378634).

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

21445553430 is a wasteful number, since it uses less digits than its factorization.

21445553430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34040581 (or 34040578 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 36.

The spelling of 21445553430 in words is "twenty-one billion, four hundred forty-five million, five hundred fifty-three thousand, four hundred thirty".