100001021021 has 4 divisors (see below), whose sum is σ = 109092022944. Its totient is φ = 90910019100.

The previous prime is 100001020969. The next prime is 100001021023. The reversal of 100001021021 is 120120100001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 100001021021 - 2⁶ = 100001020957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100001021023) 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 3 ways as a sum of consecutive naturals, for example, 4545500945 + ... + 4545500966.

It is an arithmetic number, because the mean of its divisors is an integer number (27273005736).

Almost surely, 2^100001021021 is an apocalyptic number.

100001021021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

100001021021 is a deficient number, since it is larger than the sum of its proper divisors (9091001923).

100001021021 is an equidigital number, since it uses as much as digits as its factorization.

100001021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9091001922.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 100001021021 its reverse (120120100001), we get a palindrome (220121121022).

The spelling of 100001021021 in words is "one hundred billion, one million, twenty-one thousand, twenty-one".