21053533424004 has 36 divisors (see below), whose sum is σ = 54935384707840. Its totient is φ = 6791462394480.

The previous prime is 21053533423999. The next prime is 21053533424009. The reversal of 21053533424004 is 40042433535012.

21053533424004 is a `hidden beast` number, since 2 + 10 + 535 + 33 + 42 + 40 + 0 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (21053533423999) and next prime (21053533424009).

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21053533424004.

It is not an unprimeable number, because it can be changed into a prime (21053533424009) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9432585544 + ... + 9432587775.

Almost surely, 2^{21053533424004} is an apocalyptic number.

It is an amenable number.

21053533424004 is an abundant number, since it is smaller than the sum of its proper divisors (33881851283836).

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

21053533424004 is a wasteful number, since it uses less digits than its factorization.

21053533424004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18865173360 (or 18865173355 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 36.

Adding to 21053533424004 its reverse (40042433535012), we get a palindrome (61095966959016).

The spelling of 21053533424004 in words is "twenty-one trillion, fifty-three billion, five hundred thirty-three million, four hundred twenty-four thousand, four".