68211621 has 6 divisors (see below), whose sum is σ = 98527910. Its totient is φ = 45474408.

The previous prime is 68211613. The next prime is 68211623. The reversal of 68211621 is 12611286.

It can be written as a sum of positive squares in only one way, i.e., 59444100 + 8767521 = 7710^2 + 2961^2 .

It is not a de Polignac number, because 68211621 - 2³ = 68211613 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 (68211623) 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 5 ways as a sum of consecutive naturals, for example, 3789526 + ... + 3789543.

Almost surely, 2^68211621 is an apocalyptic number.

It is an amenable number.

68211621 is a deficient number, since it is larger than the sum of its proper divisors (30316289).

68211621 is a wasteful number, since it uses less digits than its factorization.

68211621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7579075 (or 7579072 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 68211621 is about 8259.0326915445. The cubic root of 68211621 is about 408.5884854113.

The spelling of 68211621 in words is "sixty-eight million, two hundred eleven thousand, six hundred twenty-one".