121111120221210 has 512 divisors, whose sum is σ = 375386711040000. Its totient is φ = 27215721308160.

The previous prime is 121111120221127. The next prime is 121111120221211. The reversal of 121111120221210 is 12122021111121.

It is a happy number.

121111120221210 is a `hidden beast` number, since 1 + 2 + 1 + 111 + 120 + 221 + 210 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (121111120221211) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 18106009546 + ... + 18106016234.

It is an arithmetic number, because the mean of its divisors is an integer number (733177170000).

Almost surely, 2^{121111120221210} is an apocalyptic number.

121111120221210 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 121111120221210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (187693355520000).

121111120221210 is an abundant number, since it is smaller than the sum of its proper divisors (254275590818790).

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

121111120221210 is a wasteful number, since it uses less digits than its factorization.

121111120221210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7491 (or 7485 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 121111120221210 its reverse (12122021111121), we get a palindrome (133233141332331).

The spelling of 121111120221210 in words is "one hundred twenty-one trillion, one hundred eleven billion, one hundred twenty million, two hundred twenty-one thousand, two hundred ten".