145219756421 has 8 divisors (see below), whose sum is σ = 153969056064. Its totient is φ = 136493452480.

The previous prime is 145219756369. The next prime is 145219756447. The reversal of 145219756421 is 124657912541.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145219756421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145219756481) 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, 5735915 + ... + 5761176.

It is an arithmetic number, because the mean of its divisors is an integer number (19246132008).

Almost surely, 2^145219756421 is an apocalyptic number.

It is an amenable number.

145219756421 is a deficient number, since it is larger than the sum of its proper divisors (8749299643).

145219756421 is a wasteful number, since it uses less digits than its factorization.

145219756421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11497851.

The product of its digits is 604800, while the sum is 47.

The spelling of 145219756421 in words is "one hundred forty-five billion, two hundred nineteen million, seven hundred fifty-six thousand, four hundred twenty-one".