121121610210 has 96 divisors (see below), whose sum is σ = 331796424960. Its totient is φ = 30570925824.

The previous prime is 121121610193. The next prime is 121121610299. The reversal of 121121610210 is 12016121121.

121121610210 is a `hidden beast` number, since 1 + 2 + 11 + 21 + 610 + 21 + 0 = 666.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1854022 + ... + 1918238.

It is an arithmetic number, because the mean of its divisors is an integer number (3456212760).

Almost surely, 2^121121610210 is an apocalyptic number.

121121610210 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 121121610210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165898212480).

121121610210 is an abundant number, since it is smaller than the sum of its proper divisors (210674814750).

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

121121610210 is a wasteful number, since it uses less digits than its factorization.

121121610210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65352 (or 65349 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 121121610210 its reverse (12016121121), we get a palindrome (133137731331).

The spelling of 121121610210 in words is "one hundred twenty-one billion, one hundred twenty-one million, six hundred ten thousand, two hundred ten".