100121210442 has 96 divisors (see below), whose sum is σ = 238946460480. Its totient is φ = 30046464000.

The previous prime is 100121210417. The next prime is 100121210489. The reversal of 100121210442 is 244012121001.

100121210442 is a `hidden beast` number, since 1 + 0 + 0 + 1 + 212 + 10 + 442 = 666.

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 47 ways as a sum of consecutive naturals, for example, 11582442 + ... + 11591082.

It is an arithmetic number, because the mean of its divisors is an integer number (2489025630).

Almost surely, 2^100121210442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 100121210442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119473230240).

100121210442 is an abundant number, since it is smaller than the sum of its proper divisors (138825250038).

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

100121210442 is a wasteful number, since it uses less digits than its factorization.

100121210442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9220 (or 9217 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 100121210442 its reverse (244012121001), we get a palindrome (344133331443).

The spelling of 100121210442 in words is "one hundred billion, one hundred twenty-one million, two hundred ten thousand, four hundred forty-two".