21120201 has 12 divisors (see below), whose sum is σ = 30563520. Its totient is φ = 14054040.

The previous prime is 21120193. The next prime is 21120223. The reversal of 21120201 is 10202112.

It is not a de Polignac number, because 21120201 - 2³ = 21120193 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (21120251) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3820 + ... + 7538.

It is an arithmetic number, because the mean of its divisors is an integer number (2546960).

Almost surely, 2^21120201 is an apocalyptic number.

It is an amenable number.

21120201 is a deficient number, since it is larger than the sum of its proper divisors (9443319).

21120201 is a wasteful number, since it uses less digits than its factorization.

21120201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4356 (or 4353 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 21120201 is about 4595.6719856839. The cubic root of 21120201 is about 276.4178060885.

Adding to 21120201 its reverse (10202112), we get a palindrome (31322313).

It can be divided in two parts, 21120 and 201, that added together give a triangular number (21321 = T₂₀₆).

The spelling of 21120201 in words is "twenty-one million, one hundred twenty thousand, two hundred one".