21014377 has 4 divisors (see below), whose sum is σ = 21043780. Its totient is φ = 20984976.

The previous prime is 21014351. The next prime is 21014381. The reversal of 21014377 is 77341012.

It is a happy number.

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 19175641 + 1838736 = 4379^2 + 1356^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21014377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21014327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13602 + ... + 15067.

It is an arithmetic number, because the mean of its divisors is an integer number (5260945).

Almost surely, 2^21014377 is an apocalyptic number.

It is an amenable number.

21014377 is a deficient number, since it is larger than the sum of its proper divisors (29403).

21014377 is an equidigital number, since it uses as much as digits as its factorization.

21014377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29402.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 21014377 is about 4584.1440858682. The cubic root of 21014377 is about 275.9553636770.

Adding to 21014377 its reverse (77341012), we get a palindrome (98355389).

The spelling of 21014377 in words is "twenty-one million, fourteen thousand, three hundred seventy-seven".