21149201 has 8 divisors (see below), whose sum is σ = 21826560. Its totient is φ = 20481408.

The previous prime is 21149197. The next prime is 21149221. The reversal of 21149201 is 10294112.

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 21149201 - 2² = 21149197 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21149221) 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, 2240 + ... + 6878.

It is an arithmetic number, because the mean of its divisors is an integer number (2728320).

Almost surely, 2^21149201 is an apocalyptic number.

It is an amenable number.

21149201 is a deficient number, since it is larger than the sum of its proper divisors (677359).

21149201 is an equidigital number, since it uses as much as digits as its factorization.

21149201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4783.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 21149201 is about 4598.8260458513. The cubic root of 21149201 is about 276.5442640109.

The spelling of 21149201 in words is "twenty-one million, one hundred forty-nine thousand, two hundred one".