121211232220 has 48 divisors (see below), whose sum is σ = 274171534560. Its totient is φ = 44747133696.

The previous prime is 121211232209. The next prime is 121211232251. The reversal of 121211232220 is 22232112121.

It is a super-2 number, since 2×121211232220² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1582119 + ... + 1656961.

It is an arithmetic number, because the mean of its divisors is an integer number (5711906970).

Almost surely, 2^121211232220 is an apocalyptic number.

121211232220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121211232220 is an abundant number, since it is smaller than the sum of its proper divisors (152960302340).

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

121211232220 is a wasteful number, since it uses less digits than its factorization.

121211232220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81094 (or 81092 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 121211232220 its reverse (22232112121), we get a palindrome (143443344341).

The spelling of 121211232220 in words is "one hundred twenty-one billion, two hundred eleven million, two hundred thirty-two thousand, two hundred twenty".