121121220102210 has 48 divisors (see below), whose sum is σ = 314916990346296. Its totient is φ = 32298805557504.

The previous prime is 121121220102191. The next prime is 121121220102227. The reversal of 121121220102210 is 12201022121121.

121121220102210 is a `hidden beast` number, since 1 + 211 + 2 + 1 + 220 + 10 + 221 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 117280517729769 + 3840702372441 = 10829613^2 + 1959771^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12156972 + ... + 19749288.

Almost surely, 2^{121121220102210} is an apocalyptic number.

121121220102210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121121220102210 is an abundant number, since it is smaller than the sum of its proper divisors (193795770244086).

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

121121220102210 is a wasteful number, since it uses less digits than its factorization.

121121220102210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7769587 (or 7769584 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 121121220102210 its reverse (12201022121121), we get a palindrome (133322242223331).

The spelling of 121121220102210 in words is "one hundred twenty-one trillion, one hundred twenty-one billion, two hundred twenty million, one hundred two thousand, two hundred ten".