100120621842 has 24 divisors (see below), whose sum is σ = 216957165516. Its totient is φ = 33369055776.

The previous prime is 100120621837. The next prime is 100120621889. The reversal of 100120621842 is 248126021001.

100120621842 is a `hidden beast` number, since 10 + 0 + 1 + 20 + 621 + 8 + 4 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 100109592801 + 11029041 = 316401^2 + 3321^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 234673 + ... + 505284.

Almost surely, 2^100120621842 is an apocalyptic number.

100120621842 is an abundant number, since it is smaller than the sum of its proper divisors (116836543674).

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

100120621842 is a wasteful number, since it uses less digits than its factorization.

100120621842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 747482 (or 747479 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

Adding to 100120621842 its reverse (248126021001), we get a palindrome (348246642843).

The spelling of 100120621842 in words is "one hundred billion, one hundred twenty million, six hundred twenty-one thousand, eight hundred forty-two".