21101166001 has 4 divisors (see below), whose sum is σ = 21102790000. Its totient is φ = 21099542004.

The previous prime is 21101165983. The next prime is 21101166083. The reversal of 21101166001 is 10066110112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21101166001 - 2⁷ = 21101165873 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21101166001.

It is not an unprimeable number, because it can be changed into a prime (21101166301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 792351 + ... + 818548.

It is an arithmetic number, because the mean of its divisors is an integer number (5275697500).

Almost surely, 2^21101166001 is an apocalyptic number.

It is an amenable number.

21101166001 is a deficient number, since it is larger than the sum of its proper divisors (1623999).

21101166001 is a wasteful number, since it uses less digits than its factorization.

21101166001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1623998.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 21101166001 its reverse (10066110112), we get a palindrome (31167276113).

The spelling of 21101166001 in words is "twenty-one billion, one hundred one million, one hundred sixty-six thousand, one".