121222221021 has 48 divisors (see below), whose sum is σ = 194478036480. Its totient is φ = 72147411360.

The previous prime is 121222220969. The next prime is 121222221041. The reversal of 121222221021 is 120122222121.

It is a happy number.

121222221021 is a `hidden beast` number, since 1 + 212 + 222 + 210 + 21 = 666.

It is not a de Polignac number, because 121222221021 - 2¹⁰ = 121222219997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121222220985 and 121222221003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121222221041) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 1328070 + ... + 1416408.

It is an arithmetic number, because the mean of its divisors is an integer number (4051625760).

Almost surely, 2^121222221021 is an apocalyptic number.

121222221021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121222221021 is a deficient number, since it is larger than the sum of its proper divisors (73255815459).

121222221021 is a wasteful number, since it uses less digits than its factorization.

121222221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88606 (or 88603 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 121222221021 its reverse (120122222121), we get a palindrome (241344443142).

It can be divided in two parts, 121222 and 221021, that added together give a palindrome (342243).

The spelling of 121222221021 in words is "one hundred twenty-one billion, two hundred twenty-two million, two hundred twenty-one thousand, twenty-one".