100120101122021 has 4 divisors (see below), whose sum is σ = 101111389252044. Its totient is φ = 99128812992000.

The previous prime is 100120101121991. The next prime is 100120101122029. The reversal of 100120101122021 is 120221101021001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 63526240012225 + 36593861109796 = 7970335^2 + 6049286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100120101122021 is a prime.

It is a super-2 number, since 2×100120101122021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100120101121987 and 100120101122005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100120101122029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 495644064860 + ... + 495644065061.

It is an arithmetic number, because the mean of its divisors is an integer number (25277847313011).

Almost surely, 2^{100120101122021} is an apocalyptic number.

It is an amenable number.

100120101122021 is a deficient number, since it is larger than the sum of its proper divisors (991288130023).

100120101122021 is an equidigital number, since it uses as much as digits as its factorization.

100120101122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991288130022.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 100120101122021 its reverse (120221101021001), we get a palindrome (220341202143022).

The spelling of 100120101122021 in words is "one hundred trillion, one hundred twenty billion, one hundred one million, one hundred twenty-two thousand, twenty-one".