145505612421 has 12 divisors (see below), whose sum is σ = 226342063948. Its totient is φ = 89541915264.

The previous prime is 145505612411. The next prime is 145505612443. The reversal of 145505612421 is 124216505541.

145505612421 is a `hidden beast` number, since 1 + 4 + 5 + 50 + 561 + 2 + 42 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 60147562500 + 85358049921 = 245250^2 + 292161^2 .

It is not a de Polignac number, because 145505612421 - 2¹¹ = 145505610373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145505612411) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 621818740 + ... + 621818973.

Almost surely, 2^145505612421 is an apocalyptic number.

It is an amenable number.

145505612421 is a deficient number, since it is larger than the sum of its proper divisors (80836451527).

145505612421 is a wasteful number, since it uses less digits than its factorization.

145505612421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1243637732 (or 1243637729 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 36.

The spelling of 145505612421 in words is "one hundred forty-five billion, five hundred five million, six hundred twelve thousand, four hundred twenty-one".