67700021 has 4 divisors (see below), whose sum is σ = 71263200. Its totient is φ = 64136844.

The previous prime is 67700011. The next prime is 67700023. The reversal of 67700021 is 12000776.

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 a de Polignac number, because none of the positive numbers 2^k-67700021 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 67700021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67700023) 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, 1781561 + ... + 1781598.

It is an arithmetic number, because the mean of its divisors is an integer number (17815800).

Almost surely, 2^67700021 is an apocalyptic number.

It is an amenable number.

67700021 is a deficient number, since it is larger than the sum of its proper divisors (3563179).

67700021 is a wasteful number, since it uses less digits than its factorization.

67700021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3563178.

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 67700021 is about 8228.0022484197. The cubic root of 67700021 is about 407.5644240547.

Adding to 67700021 its reverse (12000776), we get a palindrome (79700797).

The spelling of 67700021 in words is "sixty-seven million, seven hundred thousand, twenty-one".