21077941 has 4 divisors (see below), whose sum is σ = 21475692. Its totient is φ = 20680192.

The previous prime is 21077929. The next prime is 21077951. The reversal of 21077941 is 14977012.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10048900 + 11029041 = 3170^2 + 3321^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21077941 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 (21077951) 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, 198796 + ... + 198901.

It is an arithmetic number, because the mean of its divisors is an integer number (5368923).

Almost surely, 2^21077941 is an apocalyptic number.

It is an amenable number.

21077941 is a deficient number, since it is larger than the sum of its proper divisors (397751).

21077941 is an equidigital number, since it uses as much as digits as its factorization.

21077941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397750.

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 21077941 is about 4591.0718792021. The cubic root of 21077941 is about 276.2333189493.

The spelling of 21077941 in words is "twenty-one million, seventy-seven thousand, nine hundred forty-one".