23067521 has 4 divisors (see below), whose sum is σ = 24424452. Its totient is φ = 21710592.

The previous prime is 23067509. The next prime is 23067523. The reversal of 23067521 is 12576032.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12250000 + 10817521 = 3500^2 + 3289^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23067521 is a prime.

It is a super-2 number, since 2×23067521² = 1064221050170882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23067523) 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, 678440 + ... + 678473.

It is an arithmetic number, because the mean of its divisors is an integer number (6106113).

Almost surely, 2^23067521 is an apocalyptic number.

It is an amenable number.

23067521 is a deficient number, since it is larger than the sum of its proper divisors (1356931).

23067521 is a wasteful number, since it uses less digits than its factorization.

23067521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1356930.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 23067521 is about 4802.8659152635. The cubic root of 23067521 is about 284.6647170335.

The spelling of 23067521 in words is "twenty-three million, sixty-seven thousand, five hundred twenty-one".