23130145321021 has 2 divisors, whose sum is σ = 23130145321022. Its totient is φ = 23130145321020.

The previous prime is 23130145321009. The next prime is 23130145321057. The reversal of 23130145321021 is 12012354103132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16263387118521 + 6866758202500 = 4032789^2 + 2620450^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23130145321021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23130145321061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11565072660510 + 11565072660511.

It is an arithmetic number, because the mean of its divisors is an integer number (11565072660511).

Almost surely, 2^{23130145321021} is an apocalyptic number.

It is an amenable number.

23130145321021 is a deficient number, since it is larger than the sum of its proper divisors (1).

23130145321021 is an equidigital number, since it uses as much as digits as its factorization.

23130145321021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 28.

Adding to 23130145321021 its reverse (12012354103132), we get a palindrome (35142499424153).

The spelling of 23130145321021 in words is "twenty-three trillion, one hundred thirty billion, one hundred forty-five million, three hundred twenty-one thousand, twenty-one".