23251221437 has 2 divisors, whose sum is σ = 23251221438. Its totient is φ = 23251221436.

The previous prime is 23251221403. The next prime is 23251221473. The reversal of 23251221437 is 73412215232.

Together with next prime (23251221473) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23243746681 + 7474756 = 152459^2 + 2734^2 .

It is a cyclic number.

It is not a de Polignac number, because 23251221437 - 2³⁰ = 22177479613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23251221737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11625610718 + 11625610719.

It is an arithmetic number, because the mean of its divisors is an integer number (11625610719).

Almost surely, 2^23251221437 is an apocalyptic number.

It is an amenable number.

23251221437 is a deficient number, since it is larger than the sum of its proper divisors (1).

23251221437 is an equidigital number, since it uses as much as digits as its factorization.

23251221437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 32.

Adding to 23251221437 its reverse (73412215232), we get a palindrome (96663436669).

The spelling of 23251221437 in words is "twenty-three billion, two hundred fifty-one million, two hundred twenty-one thousand, four hundred thirty-seven".