65221403 has 4 divisors (see below), whose sum is σ = 70238448. Its totient is φ = 60204360.

The previous prime is 65221397. The next prime is 65221423. The reversal of 65221403 is 30412256.

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

It is a cyclic number.

It is not a de Polignac number, because 65221403 - 2¹² = 65217307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65221423) 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, 2508503 + ... + 2508528.

It is an arithmetic number, because the mean of its divisors is an integer number (17559612).

Almost surely, 2^65221403 is an apocalyptic number.

65221403 is a deficient number, since it is larger than the sum of its proper divisors (5017045).

65221403 is a wasteful number, since it uses less digits than its factorization.

65221403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5017044.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 65221403 is about 8075.9769068516. The cubic root of 65221403 is about 402.5285717151.

Adding to 65221403 its reverse (30412256), we get a palindrome (95633659).

The spelling of 65221403 in words is "sixty-five million, two hundred twenty-one thousand, four hundred three".