21155154404510 has 96 divisors (see below), whose sum is σ = 45037150964640. Its totient is φ = 7131964896000.

The previous prime is 21155154404443. The next prime is 21155154404519. The reversal of 21155154404510 is 1540445155112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21155154404519) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 92814185 + ... + 93041835.

It is an arithmetic number, because the mean of its divisors is an integer number (469136989215).

Almost surely, 2^{21155154404510} is an apocalyptic number.

21155154404510 is an abundant number, since it is smaller than the sum of its proper divisors (23881996560130).

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

21155154404510 is a wasteful number, since it uses less digits than its factorization.

21155154404510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230842 (or 230835 counting only the distinct ones).

The product of its (nonzero) digits is 80000, while the sum is 38.

Adding to 21155154404510 its reverse (1540445155112), we get a palindrome (22695599559622).

The spelling of 21155154404510 in words is "twenty-one trillion, one hundred fifty-five billion, one hundred fifty-four million, four hundred four thousand, five hundred ten".