68530021 has 4 divisors (see below), whose sum is σ = 78320032. Its totient is φ = 58740012.

The previous prime is 68529997. The next prime is 68530027. The reversal of 68530021 is 12003586.

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 68530021 - 2⁹ = 68529509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68530027) 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, 4894995 + ... + 4895008.

It is an arithmetic number, because the mean of its divisors is an integer number (19580008).

Almost surely, 2^68530021 is an apocalyptic number.

It is an amenable number.

68530021 is a deficient number, since it is larger than the sum of its proper divisors (9790011).

68530021 is an equidigital number, since it uses as much as digits as its factorization.

68530021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9790010.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 68530021 is about 8278.2861148912. The cubic root of 68530021 is about 409.2232388230.

The spelling of 68530021 in words is "sixty-eight million, five hundred thirty thousand, twenty-one".