243090221121 has 20 divisors (see below), whose sum is σ = 396147028464. Its totient is φ = 147327406200.

The previous prime is 243090221027. The next prime is 243090221123. The reversal of 243090221121 is 121122090342.

243090221121 is a `hidden beast` number, since 2 + 430 + 9 + 0 + 221 + 1 + 2 + 1 = 666.

It is not a de Polignac number, because 243090221121 - 2⁷ = 243090220993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (243090221123) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 136413375 + ... + 136415156.

Almost surely, 2^243090221121 is an apocalyptic number.

It is an amenable number.

243090221121 is a deficient number, since it is larger than the sum of its proper divisors (153056807343).

243090221121 is a wasteful number, since it uses less digits than its factorization.

243090221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272828554 (or 272828545 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

It can be divided in two parts, 243090221 and 121, that added together give a palindrome (243090342).

The spelling of 243090221121 in words is "two hundred forty-three billion, ninety million, two hundred twenty-one thousand, one hundred twenty-one".