67220521 has 8 divisors (see below), whose sum is σ = 69638400. Its totient is φ = 64809360.

The previous prime is 67220501. The next prime is 67220563. The reversal of 67220521 is 12502276.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 67220521 - 2¹⁹ = 66696233 is a prime.

It is a super-2 number, since 2×67220521² = 9037196887022882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67220501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27570 + ... + 29908.

It is an arithmetic number, because the mean of its divisors is an integer number (8704800).

Almost surely, 2^67220521 is an apocalyptic number.

It is an amenable number.

67220521 is a deficient number, since it is larger than the sum of its proper divisors (2417879).

67220521 is a wasteful number, since it uses less digits than its factorization.

67220521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3359.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 67220521 is about 8198.8121700646. The cubic root of 67220521 is about 406.5999223825.

Adding to 67220521 its reverse (12502276), we get a palindrome (79722797).

The spelling of 67220521 in words is "sixty-seven million, two hundred twenty thousand, five hundred twenty-one".