145221116521 has 24 divisors (see below), whose sum is σ = 165556777344. Its totient is φ = 126609959520.

The previous prime is 145221116497. The next prime is 145221116539. The reversal of 145221116521 is 125611122541.

It is not a de Polignac number, because 145221116521 - 2⁹ = 145221116009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145221116321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1506640 + ... + 1600126.

It is an arithmetic number, because the mean of its divisors is an integer number (6898199056).

Almost surely, 2^145221116521 is an apocalyptic number.

It is an amenable number.

145221116521 is a deficient number, since it is larger than the sum of its proper divisors (20335660823).

145221116521 is a wasteful number, since it uses less digits than its factorization.

145221116521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93869 (or 93850 counting only the distinct ones).

The product of its digits is 4800, while the sum is 31.

The spelling of 145221116521 in words is "one hundred forty-five billion, two hundred twenty-one million, one hundred sixteen thousand, five hundred twenty-one".