68102821 has 4 divisors (see below), whose sum is σ = 71687200. Its totient is φ = 64518444.

The previous prime is 68102807. The next prime is 68102831. The reversal of 68102821 is 12820186.

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 68102821 - 2⁵ = 68102789 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68102821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68102831) 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, 1792161 + ... + 1792198.

It is an arithmetic number, because the mean of its divisors is an integer number (17921800).

Almost surely, 2^68102821 is an apocalyptic number.

It is an amenable number.

68102821 is a deficient number, since it is larger than the sum of its proper divisors (3584379).

68102821 is a wasteful number, since it uses less digits than its factorization.

68102821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3584378.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 68102821 is about 8252.4433351584. The cubic root of 68102821 is about 408.3711320093.

The spelling of 68102821 in words is "sixty-eight million, one hundred two thousand, eight hundred twenty-one".