100121101020 has 36 divisors (see below), whose sum is σ = 303700673640. Its totient is φ = 26698960224.

The previous prime is 100121101001. The next prime is 100121101079. The reversal of 100121101020 is 20101121001.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a junction number, because it is equal to n+sod(n) for n = 100121100993 and 100121101011.

It is a congruent number.

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, 278113990 + ... + 278114349.

Almost surely, 2^100121101020 is an apocalyptic number.

100121101020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100121101020 is an abundant number, since it is smaller than the sum of its proper divisors (203579572620).

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

100121101020 is a wasteful number, since it uses less digits than its factorization.

100121101020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556228354 (or 556228349 counting only the distinct ones).

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

Adding to 100121101020 its reverse (20101121001), we get a palindrome (120222222021).

The spelling of 100121101020 in words is "one hundred billion, one hundred twenty-one million, one hundred one thousand, twenty".