121221222010 has 96 divisors (see below), whose sum is σ = 255090062592. Its totient is φ = 41354651520.

The previous prime is 121221222007. The next prime is 121221222029. The reversal of 121221222010 is 10222122121.

It is a happy 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 47 ways as a sum of consecutive naturals, for example, 133063455 + ... + 133064365.

It is an arithmetic number, because the mean of its divisors is an integer number (2657188152).

Almost surely, 2^121221222010 is an apocalyptic number.

121221222010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121221222010 is an abundant number, since it is smaller than the sum of its proper divisors (133868840582).

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

121221222010 is a wasteful number, since it uses less digits than its factorization.

121221222010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1988 (or 1981 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 121221222010 its reverse (10222122121), we get a palindrome (131443344131).

The spelling of 121221222010 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred twenty-two thousand, ten".