67050021 has 4 divisors (see below), whose sum is σ = 89400032. Its totient is φ = 44700012.

The previous prime is 67049987. The next prime is 67050043. The reversal of 67050021 is 12005076.

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 not a de Polignac number, because 67050021 - 2⁷ = 67049893 is a prime.

It is a super-2 number, since 2×67050021² = 8991410632200882, which contains 22 as substring.

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 67050021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67050121) 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, 11175001 + ... + 11175006.

It is an arithmetic number, because the mean of its divisors is an integer number (22350008).

Almost surely, 2^67050021 is an apocalyptic number.

It is an amenable number.

67050021 is a deficient number, since it is larger than the sum of its proper divisors (22350011).

67050021 is a wasteful number, since it uses less digits than its factorization.

67050021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22350010.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 67050021 is about 8188.4077206744. The cubic root of 67050021 is about 406.2558608701.

Adding to 67050021 its reverse (12005076), we get a palindrome (79055097).

The spelling of 67050021 in words is "sixty-seven million, fifty thousand, twenty-one".