21449191 has 8 divisors (see below), whose sum is σ = 22050000. Its totient is φ = 20852160.

The previous prime is 21449167. The next prime is 21449201. The reversal of 21449191 is 19194412.

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 21449191 - 2¹³ = 21440999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21449161) 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, 13560 + ... + 15058.

It is an arithmetic number, because the mean of its divisors is an integer number (2756250).

Almost surely, 2^21449191 is an apocalyptic number.

21449191 is a deficient number, since it is larger than the sum of its proper divisors (600809).

21449191 is a wasteful number, since it uses less digits than its factorization.

21449191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1889.

The product of its digits is 2592, while the sum is 31.

The square root of 21449191 is about 4631.3271316114. The cubic root of 21449191 is about 277.8456737083.

The spelling of 21449191 in words is "twenty-one million, four hundred forty-nine thousand, one hundred ninety-one".