23015021 has 2 divisors, whose sum is σ = 23015022. Its totient is φ = 23015020.

The previous prime is 23015017. The next prime is 23015029. The reversal of 23015021 is 12051032.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13060996 + 9954025 = 3614^2 + 3155^2 .

It is a cyclic number.

It is not a de Polignac number, because 23015021 - 2² = 23015017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23014987 and 23015005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23015029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11507510 + 11507511.

It is an arithmetic number, because the mean of its divisors is an integer number (11507511).

Almost surely, 2^23015021 is an apocalyptic number.

It is an amenable number.

23015021 is a deficient number, since it is larger than the sum of its proper divisors (1).

23015021 is an equidigital number, since it uses as much as digits as its factorization.

23015021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 23015021 is about 4797.3973152117. The cubic root of 23015021 is about 284.4485942602.

Adding to 23015021 its reverse (12051032), we get a palindrome (35066053).

It can be divided in two parts, 230 and 15021, that added together give a palindrome (15251).

The spelling of 23015021 in words is "twenty-three million, fifteen thousand, twenty-one".