68088221 has 4 divisors (see below), whose sum is σ = 69671712. Its totient is φ = 66504732.

The previous prime is 68088217. The next prime is 68088227. The reversal of 68088221 is 12288086.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12288086 = 2 ⋅6144043.

It is a cyclic number.

It is not a de Polignac number, because 68088221 - 2² = 68088217 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 (68088227) 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, 791681 + ... + 791766.

It is an arithmetic number, because the mean of its divisors is an integer number (17417928).

Almost surely, 2^68088221 is an apocalyptic number.

It is an amenable number.

68088221 is a deficient number, since it is larger than the sum of its proper divisors (1583491).

68088221 is a wasteful number, since it uses less digits than its factorization.

68088221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1583490.

The product of its (nonzero) digits is 12288, while the sum is 35.

The square root of 68088221 is about 8251.5587012394. The cubic root of 68088221 is about 408.3419474882.

The spelling of 68088221 in words is "sixty-eight million, eighty-eight thousand, two hundred twenty-one".