21449370 has 32 divisors (see below), whose sum is σ = 51995520. Its totient is φ = 5662400.

The previous prime is 21449353. The next prime is 21449387. The reversal of 21449370 is 7394412.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21449353) and next prime (21449387).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 510 + ... + 6569.

It is an arithmetic number, because the mean of its divisors is an integer number (1624860).

Almost surely, 2^21449370 is an apocalyptic number.

21449370 is an abundant number, since it is smaller than the sum of its proper divisors (30546150).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21449370 is a wasteful number, since it uses less digits than its factorization.

21449370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7190.

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

The square root of 21449370 is about 4631.3464564854. The cubic root of 21449370 is about 277.8464466083.

The spelling of 21449370 in words is "twenty-one million, four hundred forty-nine thousand, three hundred seventy".