100121020011 has 24 divisors (see below), whose sum is σ = 152288227520. Its totient is φ = 63210470256.

The previous prime is 100121020003. The next prime is 100121020033. The reversal of 100121020011 is 110020121001.

It is a happy number.

It is not a de Polignac number, because 100121020011 - 2³ = 100121020003 is a prime.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100121019975 and 100121020002.

It is not an unprimeable number, because it can be changed into a prime (100121020091) 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, 349680 + ... + 567906.

Almost surely, 2^100121020011 is an apocalyptic number.

100121020011 is a deficient number, since it is larger than the sum of its proper divisors (52167207509).

100121020011 is a wasteful number, since it uses less digits than its factorization.

100121020011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220935 (or 220932 counting only the distinct ones).

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

Adding to 100121020011 its reverse (110020121001), we get a palindrome (210141141012).

The spelling of 100121020011 in words is "one hundred billion, one hundred twenty-one million, twenty thousand, eleven".