21320121104404 has 48 divisors (see below), whose sum is σ = 39412593360000. Its totient is φ = 10071234809856.

The previous prime is 21320121104371. The next prime is 21320121104483. The reversal of 21320121104404 is 40440112102312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2059212 + ... + 6846940.

It is an arithmetic number, because the mean of its divisors is an integer number (821095695000).

Almost surely, 2^{21320121104404} is an apocalyptic number.

It is an amenable number.

21320121104404 is a deficient number, since it is larger than the sum of its proper divisors (18092472255596).

21320121104404 is a wasteful number, since it uses less digits than its factorization.

21320121104404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4788352 (or 4788350 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 21320121104404 its reverse (40440112102312), we get a palindrome (61760233206716).

The spelling of 21320121104404 in words is "twenty-one trillion, three hundred twenty billion, one hundred twenty-one million, one hundred four thousand, four hundred four".