21102161201 has 4 divisors (see below), whose sum is σ = 23020539504. Its totient is φ = 19183782900.

The previous prime is 21102161177. The next prime is 21102161203. The reversal of 21102161201 is 10216120112.

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 21102161201 - 2³⁰ = 20028419377 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 21102161201.

It is not an unprimeable number, because it can be changed into a prime (21102161203) 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, 959189135 + ... + 959189156.

It is an arithmetic number, because the mean of its divisors is an integer number (5755134876).

Almost surely, 2^21102161201 is an apocalyptic number.

It is an amenable number.

21102161201 is a deficient number, since it is larger than the sum of its proper divisors (1918378303).

21102161201 is a wasteful number, since it uses less digits than its factorization.

21102161201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1918378302.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 21102161201 its reverse (10216120112), we get a palindrome (31318281313).

The spelling of 21102161201 in words is "twenty-one billion, one hundred two million, one hundred sixty-one thousand, two hundred one".