100001021010021 has 24 divisors (see below), whose sum is σ = 145029424044960. Its totient is φ = 66398066820000.

The previous prime is 100001021009993. The next prime is 100001021010041. The reversal of 100001021010021 is 120010120100001.

It is a happy number.

It is not a de Polignac number, because 100001021010021 - 2⁹ = 100001021009509 is a prime.

It is a super-2 number, since 2×100001021010021² (a number of 29 digits) contains 22 as substring.

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 = 100001021009985 and 100001021010012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100001021010041) 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, 39923235 + ... + 42354063.

It is an arithmetic number, because the mean of its divisors is an integer number (6042892668540).

Almost surely, 2^{100001021010021} is an apocalyptic number.

It is an amenable number.

100001021010021 is a deficient number, since it is larger than the sum of its proper divisors (45028403034939).

100001021010021 is a wasteful number, since it uses less digits than its factorization.

100001021010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2449297 (or 2449294 counting only the distinct ones).

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

Adding to 100001021010021 its reverse (120010120100001), we get a palindrome (220011141110022).

The spelling of 100001021010021 in words is "one hundred trillion, one billion, twenty-one million, ten thousand, twenty-one".