145471306021 has 2 divisors, whose sum is σ = 145471306022. Its totient is φ = 145471306020.

The previous prime is 145471305997. The next prime is 145471306069. The reversal of 145471306021 is 120603174541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128529420100 + 16941885921 = 358510^2 + 130161^2 .

It is a cyclic number.

It is not a de Polignac number, because 145471306021 - 2²⁹ = 144934435109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145471306081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72735653010 + 72735653011.

It is an arithmetic number, because the mean of its divisors is an integer number (72735653011).

Almost surely, 2^145471306021 is an apocalyptic number.

It is an amenable number.

145471306021 is a deficient number, since it is larger than the sum of its proper divisors (1).

145471306021 is an equidigital number, since it uses as much as digits as its factorization.

145471306021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 34.

The spelling of 145471306021 in words is "one hundred forty-five billion, four hundred seventy-one million, three hundred six thousand, twenty-one".