121001100102 has 48 divisors (see below), whose sum is σ = 271995709440. Its totient is φ = 40316388552.

The previous prime is 121001100097. The next prime is 121001100109. The reversal of 121001100102 is 201001100121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121001100109) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1105899 + ... + 1210377.

It is an arithmetic number, because the mean of its divisors is an integer number (5666577280).

Almost surely, 2^121001100102 is an apocalyptic number.

121001100102 is an abundant number, since it is smaller than the sum of its proper divisors (150994609338).

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

121001100102 is a wasteful number, since it uses less digits than its factorization.

121001100102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106879 (or 106867 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 121001100102 its reverse (201001100121), we get a palindrome (322002200223).

The spelling of 121001100102 in words is "one hundred twenty-one billion, one million, one hundred thousand, one hundred two".