21010067 has 8 divisors (see below), whose sum is σ = 23817360. Its totient is φ = 18372960.

The previous prime is 21010049. The next prime is 21010069. The reversal of 21010067 is 76001012.

It is a happy number.

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 21010067 - 2¹⁴ = 20993683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21010069) 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, 42284 + ... + 42777.

It is an arithmetic number, because the mean of its divisors is an integer number (2977170).

Almost surely, 2^21010067 is an apocalyptic number.

21010067 is a deficient number, since it is larger than the sum of its proper divisors (2807293).

21010067 is a wasteful number, since it uses less digits than its factorization.

21010067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85093.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 21010067 is about 4583.6739630999. The cubic root of 21010067 is about 275.9364964520.

Adding to 21010067 its reverse (76001012), we get a palindrome (97011079).

The spelling of 21010067 in words is "twenty-one million, ten thousand, sixty-seven".