221212321121120 has 96 divisors (see below), whose sum is σ = 597317625753408. Its totient is φ = 75838591531008.

The previous prime is 221212321121119. The next prime is 221212321121131. The reversal of 221212321121120 is 21121123212122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7766534 + ... + 22421946.

It is an arithmetic number, because the mean of its divisors is an integer number (6222058601598).

Almost surely, 2^{221212321121120} is an apocalyptic number.

221212321121120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221212321121120 is an abundant number, since it is smaller than the sum of its proper divisors (376105304632288).

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

221212321121120 is a wasteful number, since it uses less digits than its factorization.

221212321121120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14668912 (or 14668904 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 23.

Adding to 221212321121120 its reverse (21121123212122), we get a palindrome (242333444333242).

The spelling of 221212321121120 in words is "two hundred twenty-one trillion, two hundred twelve billion, three hundred twenty-one million, one hundred twenty-one thousand, one hundred twenty".