23121407 has 4 divisors (see below), whose sum is σ = 23333640. Its totient is φ = 22909176.

The previous prime is 23121403. The next prime is 23121419. The reversal of 23121407 is 70412132.

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

It is a cyclic number.

It is not a de Polignac number, because 23121407 - 2² = 23121403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23121403) 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, 105953 + ... + 106170.

It is an arithmetic number, because the mean of its divisors is an integer number (5833410).

Almost surely, 2^23121407 is an apocalyptic number.

23121407 is a deficient number, since it is larger than the sum of its proper divisors (212233).

23121407 is a wasteful number, since it uses less digits than its factorization.

23121407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212232.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 23121407 is about 4808.4724185546. The cubic root of 23121407 is about 284.8862046979.

Adding to 23121407 its reverse (70412132), we get a palindrome (93533539).

The spelling of 23121407 in words is "twenty-three million, one hundred twenty-one thousand, four hundred seven".