21027773 has 8 divisors (see below), whose sum is σ = 23630208. Its totient is φ = 18566064.

The previous prime is 21027767. The next prime is 21027791. The reversal of 21027773 is 37772012.

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 21027773 - 2⁶ = 21027709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21027073) 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, 34865 + ... + 35462.

It is an arithmetic number, because the mean of its divisors is an integer number (2953776).

Almost surely, 2^21027773 is an apocalyptic number.

21027773 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21027773 is a deficient number, since it is larger than the sum of its proper divisors (2602435).

21027773 is a wasteful number, since it uses less digits than its factorization.

21027773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70363.

The product of its (nonzero) digits is 4116, while the sum is 29.

The square root of 21027773 is about 4585.6049764453. The cubic root of 21027773 is about 276.0139888240.

Adding to 21027773 its reverse (37772012), we get a palindrome (58799785).

The spelling of 21027773 in words is "twenty-one million, twenty-seven thousand, seven hundred seventy-three".