21063379 has 4 divisors (see below), whose sum is σ = 21511584. Its totient is φ = 20615176.

The previous prime is 21063373. The next prime is 21063403. The reversal of 21063379 is 97336012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21063379 - 2¹⁹ = 20539091 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21063379.

It is not an unprimeable number, because it can be changed into a prime (21063373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 224032 + ... + 224125.

It is an arithmetic number, because the mean of its divisors is an integer number (5377896).

Almost surely, 2^21063379 is an apocalyptic number.

21063379 is a deficient number, since it is larger than the sum of its proper divisors (448205).

21063379 is an equidigital number, since it uses as much as digits as its factorization.

21063379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448204.

The product of its (nonzero) digits is 6804, while the sum is 31.

The square root of 21063379 is about 4589.4857010345. The cubic root of 21063379 is about 276.1696910349.

The spelling of 21063379 in words is "twenty-one million, sixty-three thousand, three hundred seventy-nine".