145351310021 has 4 divisors (see below), whose sum is σ = 147734118444. Its totient is φ = 142968501600.

The previous prime is 145351310011. The next prime is 145351310051. The reversal of 145351310021 is 120013153541.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4046740996 + 141304569025 = 63614^2 + 375905^2 .

It is a cyclic number.

It is not a de Polignac number, because 145351310021 - 2¹⁰ = 145351308997 is a prime.

It is a super-2 number, since 2×145351310021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145351310011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1191404120 + ... + 1191404241.

It is an arithmetic number, because the mean of its divisors is an integer number (36933529611).

Almost surely, 2^145351310021 is an apocalyptic number.

It is an amenable number.

145351310021 is a deficient number, since it is larger than the sum of its proper divisors (2382808423).

145351310021 is an equidigital number, since it uses as much as digits as its factorization.

145351310021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2382808422.

The product of its (nonzero) digits is 1800, while the sum is 26.

Adding to 145351310021 its reverse (120013153541), we get a palindrome (265364463562).

The spelling of 145351310021 in words is "one hundred forty-five billion, three hundred fifty-one million, three hundred ten thousand, twenty-one".