21533513215404 has 24 divisors (see below), whose sum is σ = 50387200904880. Its totient is φ = 7157503919104.

The previous prime is 21533513215397. The next prime is 21533513215433. The reversal of 21533513215404 is 40451231533512.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2541723009 + ... + 2541731480.

It is an arithmetic number, because the mean of its divisors is an integer number (2099466704370).

Almost surely, 2^{21533513215404} is an apocalyptic number.

It is an amenable number.

21533513215404 is an abundant number, since it is smaller than the sum of its proper divisors (28853687689476).

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

21533513215404 is a wasteful number, since it uses less digits than its factorization.

21533513215404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5083454849 (or 5083454847 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 39.

Adding to 21533513215404 its reverse (40451231533512), we get a palindrome (61984744748916).

The spelling of 21533513215404 in words is "twenty-one trillion, five hundred thirty-three billion, five hundred thirteen million, two hundred fifteen thousand, four hundred four".