21201101 has 4 divisors (see below), whose sum is σ = 22122912. Its totient is φ = 20279292.

The previous prime is 21201083. The next prime is 21201109. The reversal of 21201101 is 10110212.

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 21201101 - 2¹⁰ = 21200077 is a prime.

It is a super-2 number, since 2×21201101² = 898973367224402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201109) 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, 460871 + ... + 460916.

It is an arithmetic number, because the mean of its divisors is an integer number (5530728).

Almost surely, 2^21201101 is an apocalyptic number.

It is an amenable number.

21201101 is a deficient number, since it is larger than the sum of its proper divisors (921811).

21201101 is an equidigital number, since it uses as much as digits as its factorization.

21201101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921810.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 21201101 is about 4604.4653326961. The cubic root of 21201101 is about 276.7702918223.

Adding to 21201101 its reverse (10110212), we get a palindrome (31311313).

The spelling of 21201101 in words is "twenty-one million, two hundred one thousand, one hundred one".