21041377 has 4 divisors (see below), whose sum is σ = 24047296. Its totient is φ = 18035460.

The previous prime is 21041369. The next prime is 21041381. The reversal of 21041377 is 77314012.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 21041377 - 2³ = 21041369 is a prime.

It is a super-2 number, since 2×21041377² = 885479092112258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21041357) 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, 1502949 + ... + 1502962.

It is an arithmetic number, because the mean of its divisors is an integer number (6011824).

Almost surely, 2^21041377 is an apocalyptic number.

It is an amenable number.

21041377 is a deficient number, since it is larger than the sum of its proper divisors (3005919).

21041377 is an equidigital number, since it uses as much as digits as its factorization.

21041377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3005918.

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

The square root of 21041377 is about 4587.0880741490. The cubic root of 21041377 is about 276.0734987690.

Adding to 21041377 its reverse (77314012), we get a palindrome (98355389).

It can be divided in two parts, 2104 and 1377, that added together give a square (3481 = 59²).

The spelling of 21041377 in words is "twenty-one million, forty-one thousand, three hundred seventy-seven".