21454421445 has 48 divisors (see below), whose sum is σ = 37796079360. Its totient is φ = 11256216192.

The previous prime is 21454421431. The next prime is 21454421489. The reversal of 21454421445 is 54412445412.

21454421445 is a `hidden beast` number, since 21 + 454 + 42 + 144 + 5 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-21454421445 is a prime.

It is a congruent number.

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, 973842 + ... + 995628.

It is an arithmetic number, because the mean of its divisors is an integer number (787418320).

Almost surely, 2^21454421445 is an apocalyptic number.

It is an amenable number.

21454421445 is a deficient number, since it is larger than the sum of its proper divisors (16341657915).

21454421445 is a wasteful number, since it uses less digits than its factorization.

21454421445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22154 (or 22151 counting only the distinct ones).

The product of its digits is 102400, while the sum is 36.

Adding to 21454421445 its reverse (54412445412), we get a palindrome (75866866857).

The spelling of 21454421445 in words is "twenty-one billion, four hundred fifty-four million, four hundred twenty-one thousand, four hundred forty-five".