21489201 has 12 divisors (see below), whose sum is σ = 31084560. Its totient is φ = 14305560.

The previous prime is 21489191. The next prime is 21489233. The reversal of 21489201 is 10298412.

It is not a de Polignac number, because 21489201 - 2⁶ = 21489137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21489271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7510 + ... + 9968.

It is an arithmetic number, because the mean of its divisors is an integer number (2590380).

Almost surely, 2^21489201 is an apocalyptic number.

It is an amenable number.

21489201 is a deficient number, since it is larger than the sum of its proper divisors (9595359).

21489201 is a wasteful number, since it uses less digits than its factorization.

21489201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3436 (or 3433 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 21489201 is about 4635.6446153690. The cubic root of 21489201 is about 278.0183251381.

The spelling of 21489201 in words is "twenty-one million, four hundred eighty-nine thousand, two hundred one".