21370449 has 8 divisors (see below), whose sum is σ = 28977120. Its totient is φ = 14005376.

The previous prime is 21370429. The next prime is 21370451. The reversal of 21370449 is 94407312.

It is a happy number.

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 21370449 - 2⁹ = 21369937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21370409) 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, 60192 + ... + 60545.

It is an arithmetic number, because the mean of its divisors is an integer number (3622140).

Almost surely, 2^21370449 is an apocalyptic number.

It is an amenable number.

21370449 is a deficient number, since it is larger than the sum of its proper divisors (7606671).

21370449 is a wasteful number, since it uses less digits than its factorization.

21370449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120799.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 21370449 is about 4622.8182962345. The cubic root of 21370449 is about 277.5052575905.

The spelling of 21370449 in words is "twenty-one million, three hundred seventy thousand, four hundred forty-nine".