21363769 has 8 divisors (see below), whose sum is σ = 24580800. Its totient is φ = 18188016.

The previous prime is 21363739. The next prime is 21363773. The reversal of 21363769 is 96736312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21363769 - 2⁹ = 21363257 is a prime.

It is a super-2 number, since 2×21363769² = 912821251770722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21363739) 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, 9199 + ... + 11284.

It is an arithmetic number, because the mean of its divisors is an integer number (3072600).

Almost surely, 2^21363769 is an apocalyptic number.

It is an amenable number.

21363769 is a deficient number, since it is larger than the sum of its proper divisors (3217031).

21363769 is a wasteful number, since it uses less digits than its factorization.

21363769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20639.

The product of its digits is 40824, while the sum is 37.

The square root of 21363769 is about 4622.0957367843. The cubic root of 21363769 is about 277.4763402711.

The spelling of 21363769 in words is "twenty-one million, three hundred sixty-three thousand, seven hundred sixty-nine".