545543211213221 has 32 divisors (see below), whose sum is σ = 593366512677120. Its totient is φ = 498576545819136.

The previous prime is 545543211213191. The next prime is 545543211213241. The reversal of 545543211213221 is 122312112345545.

It is a cyclic number.

It is not a de Polignac number, because 545543211213221 - 2¹⁸ = 545543210951077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545543211213241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11269899800 + ... + 11269948206.

It is an arithmetic number, because the mean of its divisors is an integer number (18542703521160).

Almost surely, 2^{545543211213221} is an apocalyptic number.

It is an amenable number.

545543211213221 is a deficient number, since it is larger than the sum of its proper divisors (47823301463899).

545543211213221 is a wasteful number, since it uses less digits than its factorization.

545543211213221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65213.

The product of its digits is 288000, while the sum is 41.

Adding to 545543211213221 its reverse (122312112345545), we get a palindrome (667855323558766).

The spelling of 545543211213221 in words is "five hundred forty-five trillion, five hundred forty-three billion, two hundred eleven million, two hundred thirteen thousand, two hundred twenty-one".