21446379 has 24 divisors (see below), whose sum is σ = 31995392. Its totient is φ = 13834800.

The previous prime is 21446377. The next prime is 21446387. The reversal of 21446379 is 97364412.

21446379 is a `hidden beast` number, since 2 + 14 + 4 + 637 + 9 = 666.

It is not a de Polignac number, because 21446379 - 2¹ = 21446377 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

Its product of digits (36288) is a multiple of the sum of its prime factors (567).

It is not an unprimeable number, because it can be changed into a prime (21446371) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58254 + ... + 58620.

Almost surely, 2^21446379 is an apocalyptic number.

21446379 is a deficient number, since it is larger than the sum of its proper divisors (10549013).

21446379 is a wasteful number, since it uses less digits than its factorization.

21446379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567 (or 564 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 21446379 is about 4631.0235369732. The cubic root of 21446379 is about 277.8335312740.

The spelling of 21446379 in words is "twenty-one million, four hundred forty-six thousand, three hundred seventy-nine".