21250667 has 8 divisors (see below), whose sum is σ = 21577920. Its totient is φ = 20926080.

The previous prime is 21250637. The next prime is 21250687. The reversal of 21250667 is 76605212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21250667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21250637) 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, 19934 + ... + 20972.

It is an arithmetic number, because the mean of its divisors is an integer number (2697240).

Almost surely, 2^21250667 is an apocalyptic number.

21250667 is a deficient number, since it is larger than the sum of its proper divisors (327253).

21250667 is a wasteful number, since it uses less digits than its factorization.

21250667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 21250667 is about 4609.8445743864. The cubic root of 21250667 is about 276.9858108090.

Adding to 21250667 its reverse (76605212), we get a palindrome (97855879).

The spelling of 21250667 in words is "twenty-one million, two hundred fifty thousand, six hundred sixty-seven".