21239067 has 8 divisors (see below), whose sum is σ = 28741696. Its totient is φ = 13947912.

The previous prime is 21239059. The next prime is 21239077. The reversal of 21239067 is 76093212.

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

It is not a de Polignac number, because 21239067 - 2³ = 21239059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21239027) 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, 52633 + ... + 53034.

It is an arithmetic number, because the mean of its divisors is an integer number (3592712).

Almost surely, 2^21239067 is an apocalyptic number.

21239067 is a deficient number, since it is larger than the sum of its proper divisors (7502629).

21239067 is a wasteful number, since it uses less digits than its factorization.

21239067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105737.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 21239067 is about 4608.5862257313. The cubic root of 21239067 is about 276.9354026624.

The spelling of 21239067 in words is "twenty-one million, two hundred thirty-nine thousand, sixty-seven".