545222023021 has 4 divisors (see below), whose sum is σ = 587162178652. Its totient is φ = 503281867392.

The previous prime is 545222023013. The next prime is 545222023037. The reversal of 545222023021 is 120320222545.

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 288649382121 + 256572640900 = 537261^2 + 506530^2 .

It is a cyclic number.

It is not a de Polignac number, because 545222023021 - 2³ = 545222023013 is a prime.

It is a super-2 number, since 2×545222023021² (a number of 24 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 (545222003021) 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, 20970077796 + ... + 20970077821.

It is an arithmetic number, because the mean of its divisors is an integer number (146790544663).

Almost surely, 2^545222023021 is an apocalyptic number.

It is an amenable number.

545222023021 is a deficient number, since it is larger than the sum of its proper divisors (41940155631).

545222023021 is a wasteful number, since it uses less digits than its factorization.

545222023021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41940155630.

The product of its (nonzero) digits is 9600, while the sum is 28.

Adding to 545222023021 its reverse (120320222545), we get a palindrome (665542245566).

The spelling of 545222023021 in words is "five hundred forty-five billion, two hundred twenty-two million, twenty-three thousand, twenty-one".