21555134415004 has 24 divisors (see below), whose sum is σ = 37743706501200. Its totient is φ = 10771218718080.

The previous prime is 21555134414993. The next prime is 21555134415007. The reversal of 21555134415004 is 40051443155512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21555134415007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353976592 + ... + 354037480.

It is an arithmetic number, because the mean of its divisors is an integer number (1572654437550).

Almost surely, 2^{21555134415004} is an apocalyptic number.

It is an amenable number.

21555134415004 is a deficient number, since it is larger than the sum of its proper divisors (16188572086196).

21555134415004 is a wasteful number, since it uses less digits than its factorization.

21555134415004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111573 (or 111571 counting only the distinct ones).

The product of its (nonzero) digits is 240000, while the sum is 40.

The spelling of 21555134415004 in words is "twenty-one trillion, five hundred fifty-five billion, one hundred thirty-four million, four hundred fifteen thousand, four".