145623135221 has 8 divisors (see below), whose sum is σ = 150329816064. Its totient is φ = 140917026960.

The previous prime is 145623135199. The next prime is 145623135223. The reversal of 145623135221 is 122531326541.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 145623135221 - 2²² = 145618940917 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 (145623135223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 407396 + ... + 676178.

It is an arithmetic number, because the mean of its divisors is an integer number (18791227008).

Almost surely, 2^145623135221 is an apocalyptic number.

It is an amenable number.

145623135221 is a deficient number, since it is larger than the sum of its proper divisors (4706680843).

145623135221 is a wasteful number, since it uses less digits than its factorization.

145623135221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286291.

The product of its digits is 43200, while the sum is 35.

The spelling of 145623135221 in words is "one hundred forty-five billion, six hundred twenty-three million, one hundred thirty-five thousand, two hundred twenty-one".