145052123021 has 16 divisors (see below), whose sum is σ = 157453758000. Its totient is φ = 132832078848.

The previous prime is 145052123011. The next prime is 145052123057. The reversal of 145052123021 is 120321250541.

It can be written as a sum of positive squares in 8 ways, for example, as 1388382121 + 143663740900 = 37261^2 + 379030^2 .

It is a cyclic number.

It is not a de Polignac number, because 145052123021 - 2²⁶ = 144985014157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145052123011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 812645 + ... + 974933.

It is an arithmetic number, because the mean of its divisors is an integer number (9840859875).

Almost surely, 2^145052123021 is an apocalyptic number.

It is an amenable number.

145052123021 is a deficient number, since it is larger than the sum of its proper divisors (12401634979).

145052123021 is a wasteful number, since it uses less digits than its factorization.

145052123021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162848.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 145052123021 its reverse (120321250541), we get a palindrome (265373373562).

The spelling of 145052123021 in words is "one hundred forty-five billion, fifty-two million, one hundred twenty-three thousand, twenty-one".