145420405021 has 4 divisors (see below), whose sum is σ = 145430701312. Its totient is φ = 145410108732.

The previous prime is 145420404991. The next prime is 145420405093. The reversal of 145420405021 is 120504024541.

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, and also an emirpimes, since its reverse is a distinct semiprime: 120504024541 = 2131 ⋅56548111.

It is a cyclic number.

It is not a de Polignac number, because 145420405021 - 2¹⁹ = 145419880733 is a prime.

It is a super-2 number, since 2×145420405021² (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 (145420405121) 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, 5126931 + ... + 5155216.

It is an arithmetic number, because the mean of its divisors is an integer number (36357675328).

Almost surely, 2^145420405021 is an apocalyptic number.

It is an amenable number.

145420405021 is a deficient number, since it is larger than the sum of its proper divisors (10296291).

145420405021 is a wasteful number, since it uses less digits than its factorization.

145420405021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10296290.

The product of its (nonzero) digits is 6400, while the sum is 28.

Adding to 145420405021 its reverse (120504024541), we get a palindrome (265924429562).

The spelling of 145420405021 in words is "one hundred forty-five billion, four hundred twenty million, four hundred five thousand, twenty-one".