121222122210 has 336 divisors, whose sum is σ = 379929807936. Its totient is φ = 27264739968.

The previous prime is 121222122187. The next prime is 121222122221. The reversal of 121222122210 is 12221222121.

It is a happy number.

121222122210 is a `hidden beast` number, since 1 + 212 + 221 + 22 + 210 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 167 ways as a sum of consecutive naturals, for example, 813571216 + ... + 813571364.

It is an arithmetic number, because the mean of its divisors is an integer number (1130743476).

Almost surely, 2^121222122210 is an apocalyptic number.

121222122210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121222122210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (189964903968).

121222122210 is an abundant number, since it is smaller than the sum of its proper divisors (258707685726).

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

121222122210 is an equidigital number, since it uses as much as digits as its factorization.

121222122210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437 (or 273 counting only the distinct ones).

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

Adding to 121222122210 its reverse (12221222121), we get a palindrome (133443344331).

The spelling of 121222122210 in words is "one hundred twenty-one billion, two hundred twenty-two million, one hundred twenty-two thousand, two hundred ten".