221212261242 has 48 divisors (see below), whose sum is σ = 547869104640. Its totient is φ = 63191340576.

The previous prime is 221212261241. The next prime is 221212261321. The reversal of 221212261242 is 242162212122.

221212261242 is a `hidden beast` number, since 2 + 2 + 1 + 2 + 1 + 2 + 2 + 612 + 42 = 666.

It is not an unprimeable number, because it can be changed into a prime (221212261241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 498868 + ... + 831440.

It is an arithmetic number, because the mean of its divisors is an integer number (11413939680).

Almost surely, 2^221212261242 is an apocalyptic number.

221212261242 is an abundant number, since it is smaller than the sum of its proper divisors (326656843398).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221212261242 is a wasteful number, since it uses less digits than its factorization.

221212261242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337867 (or 337864 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

Adding to 221212261242 its reverse (242162212122), we get a palindrome (463374473364).

The spelling of 221212261242 in words is "two hundred twenty-one billion, two hundred twelve million, two hundred sixty-one thousand, two hundred forty-two".