21121110201 has 8 divisors (see below), whose sum is σ = 29643663520. Its totient is φ = 13339648512.

The previous prime is 21121110173. The next prime is 21121110209. The reversal of 21121110201 is 10201112112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21121110201 - 2¹⁸ = 21120848057 is a prime.

It is a super-2 number, since 2×21121110201² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121110209) 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, 185272840 + ... + 185272953.

It is an arithmetic number, because the mean of its divisors is an integer number (3705457940).

Almost surely, 2^21121110201 is an apocalyptic number.

It is an amenable number.

21121110201 is a deficient number, since it is larger than the sum of its proper divisors (8522553319).

21121110201 is a wasteful number, since it uses less digits than its factorization.

21121110201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370545815.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21121110201 its reverse (10201112112), we get a palindrome (31322222313).

The spelling of 21121110201 in words is "twenty-one billion, one hundred twenty-one million, one hundred ten thousand, two hundred one".