21101101165004 has 24 divisors (see below), whose sum is σ = 42216820504320. Its totient is φ = 9040196604816.

The previous prime is 21101101165003. The next prime is 21101101165031. The reversal of 21101101165004 is 40056110110112.

It is not an unprimeable number, because it can be changed into a prime (21101101165003) 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, 130437134 + ... + 130598805.

It is an arithmetic number, because the mean of its divisors is an integer number (1759034187680).

Almost surely, 2^{21101101165004} is an apocalyptic number.

It is an amenable number.

21101101165004 is an abundant number, since it is smaller than the sum of its proper divisors (21115719339316).

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

21101101165004 is a wasteful number, since it uses less digits than its factorization.

21101101165004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261038837 (or 261038835 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 23.

Adding to 21101101165004 its reverse (40056110110112), we get a palindrome (61157211275116).

The spelling of 21101101165004 in words is "twenty-one trillion, one hundred one billion, one hundred one million, one hundred sixty-five thousand, four".