21101321104 has 10 divisors (see below), whose sum is σ = 40883809670. Its totient is φ = 10550660544.

The previous prime is 21101321099. The next prime is 21101321107. The reversal of 21101321104 is 40112310112.

It can be written as a sum of positive squares in only one way, i.e., 18675955600 + 2425365504 = 136660^2 + 49248^2 .

It is a Harshad number since it is a multiple of its sum of digits (16), and also a Moran number because the ratio is a prime number: 1318832569 = 21101321104 / (2 + 1 + 1 + 0 + 1 + 3 + 2 + 1 + 1 + 0 + 4).

It is not an unprimeable number, because it can be changed into a prime (21101321107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 659416269 + ... + 659416300.

It is an arithmetic number, because the mean of its divisors is an integer number (4088380967).

Almost surely, 2^21101321104 is an apocalyptic number.

It is an amenable number.

21101321104 is a deficient number, since it is larger than the sum of its proper divisors (19782488566).

21101321104 is a wasteful number, since it uses less digits than its factorization.

21101321104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1318832577 (or 1318832571 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21101321104 its reverse (40112310112), we get a palindrome (61213631216).

The spelling of 21101321104 in words is "twenty-one billion, one hundred one million, three hundred twenty-one thousand, one hundred four".