21153443620005 has 128 divisors (see below), whose sum is σ = 41263022592000. Its totient is φ = 10240722535680.

The previous prime is 21153443619991. The next prime is 21153443620007. The reversal of 21153443620005 is 50002634435112.

21153443620005 is a `hidden beast` number, since 2 + 1 + 1 + 5 + 3 + 443 + 6 + 200 + 0 + 5 = 666.

It is not a de Polignac number, because 21153443620005 - 2⁹ = 21153443619493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21153443620007) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 8659024 + ... + 10829846.

It is an arithmetic number, because the mean of its divisors is an integer number (322367364000).

Almost surely, 2^{21153443620005} is an apocalyptic number.

It is an amenable number.

21153443620005 is a deficient number, since it is larger than the sum of its proper divisors (20109578971995).

21153443620005 is a wasteful number, since it uses less digits than its factorization.

21153443620005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2171016 (or 2171010 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The spelling of 21153443620005 in words is "twenty-one trillion, one hundred fifty-three billion, four hundred forty-three million, six hundred twenty thousand, five".