21011201 has 8 divisors (see below), whose sum is σ = 22516704. Its totient is φ = 19535680.

The previous prime is 21011191. The next prime is 21011231. The reversal of 21011201 is 10211012.

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

It is a cyclic number.

It is not a de Polignac number, because 21011201 - 2¹⁰ = 21010177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21011231) 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, 6035 + ... + 8856.

It is an arithmetic number, because the mean of its divisors is an integer number (2814588).

Almost surely, 2^21011201 is an apocalyptic number.

It is an amenable number.

21011201 is a deficient number, since it is larger than the sum of its proper divisors (1505503).

21011201 is a wasteful number, since it uses less digits than its factorization.

21011201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14991.

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

The square root of 21011201 is about 4583.7976613284. The cubic root of 21011201 is about 275.9414608397.

Adding to 21011201 its reverse (10211012), we get a palindrome (31222213).

It can be divided in two parts, 21011 and 201, that added together give a palindrome (21212).

The spelling of 21011201 in words is "twenty-one million, eleven thousand, two hundred one".