100020121989 has 12 divisors (see below), whose sum is σ = 135923879616. Its totient is φ = 65421961072.

The previous prime is 100020121963. The next prime is 100020122051. The reversal of 100020121989 is 989121020001.

It is not a de Polignac number, because 100020121989 - 2¹³ = 100020113797 is a prime.

It is a super-2 number, since 2×100020121989² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100020121489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5926077 + ... + 5942930.

It is an arithmetic number, because the mean of its divisors is an integer number (11326989968).

Almost surely, 2^100020121989 is an apocalyptic number.

It is an amenable number.

100020121989 is a deficient number, since it is larger than the sum of its proper divisors (35903757627).

100020121989 is an equidigital number, since it uses as much as digits as its factorization.

100020121989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11869116 (or 11869063 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 33.

The spelling of 100020121989 in words is "one hundred billion, twenty million, one hundred twenty-one thousand, nine hundred eighty-nine".