145211621 has 4 divisors (see below), whose sum is σ = 145324032. Its totient is φ = 145099212.

The previous prime is 145211611. The next prime is 145211629. The reversal of 145211621 is 126112541.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 145211621 - 2¹⁸ = 144949477 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 (145211629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54245 + ... + 56858.

It is an arithmetic number, because the mean of its divisors is an integer number (36331008).

Almost surely, 2^145211621 is an apocalyptic number.

It is an amenable number.

145211621 is a deficient number, since it is larger than the sum of its proper divisors (112411).

145211621 is a wasteful number, since it uses less digits than its factorization.

145211621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112410.

The product of its digits is 480, while the sum is 23.

The square root of 145211621 is about 12050.3784587871. The cubic root of 145211621 is about 525.6142422144.

The spelling of 145211621 in words is "one hundred forty-five million, two hundred eleven thousand, six hundred twenty-one".