221533732554231 has 4 divisors (see below), whose sum is σ = 295378310072312. Its totient is φ = 147689155036152.

The previous prime is 221533732554193. The next prime is 221533732554259. The reversal of 221533732554231 is 132455237335122.

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

It is not a de Polignac number, because 221533732554231 - 2⁷ = 221533732554103 is a prime.

It is a super-2 number, since 2×221533732554231² (a number of 29 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 (221533732555231) 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, 36922288759036 + ... + 36922288759041.

It is an arithmetic number, because the mean of its divisors is an integer number (73844577518078).

Almost surely, 2^{221533732554231} is an apocalyptic number.

221533732554231 is a deficient number, since it is larger than the sum of its proper divisors (73844577518081).

221533732554231 is an equidigital number, since it uses as much as digits as its factorization.

221533732554231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73844577518080.

The product of its digits is 4536000, while the sum is 48.

Adding to 221533732554231 its reverse (132455237335122), we get a palindrome (353988969889353).

The spelling of 221533732554231 in words is "two hundred twenty-one trillion, five hundred thirty-three billion, seven hundred thirty-two million, five hundred fifty-four thousand, two hundred thirty-one".