21776241 has 4 divisors (see below), whose sum is σ = 29034992. Its totient is φ = 14517492.

The previous prime is 21776233. The next prime is 21776243. The reversal of 21776241 is 14267712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21776241 - 2³ = 21776233 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21776199 and 21776208.

It is not an unprimeable number, because it can be changed into a prime (21776243) 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, 3629371 + ... + 3629376.

It is an arithmetic number, because the mean of its divisors is an integer number (7258748).

Almost surely, 2^21776241 is an apocalyptic number.

It is an amenable number.

21776241 is a deficient number, since it is larger than the sum of its proper divisors (7258751).

21776241 is an equidigital number, since it uses as much as digits as its factorization.

21776241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7258750.

The product of its digits is 4704, while the sum is 30.

The square root of 21776241 is about 4666.5020089999. The cubic root of 21776241 is about 279.2507220664.

The spelling of 21776241 in words is "twenty-one million, seven hundred seventy-six thousand, two hundred forty-one".