121222210000 has 50 divisors (see below), whose sum is σ = 293491116842. Its totient is φ = 48488880000.

The previous prime is 121222209991. The next prime is 121222210049. The reversal of 121222210000 is 12222121.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 58237272976 + 62984937024 = 241324^2 + 250968^2 .

It is a tau number, because it is divible by the number of its divisors (50).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 6051111 + ... + 6071110.

Almost surely, 2^121222210000 is an apocalyptic number.

121222210000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121222210000 is an abundant number, since it is smaller than the sum of its proper divisors (172268906842).

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

121222210000 is an equidigital number, since it uses as much as digits as its factorization.

121222210000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12122249 (or 12122228 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 121222210000 its reverse (12222121), we get a palindrome (121234432121).

The spelling of 121222210000 in words is "one hundred twenty-one billion, two hundred twenty-two million, two hundred ten thousand".