100121201101021 has 4 divisors (see below), whose sum is σ = 102010280367132. Its totient is φ = 98232121834912.

The previous prime is 100121201100941. The next prime is 100121201101039. The reversal of 100121201101021 is 120101102121001.

It is a happy number.

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 30204762924996 + 69916438176025 = 5495886^2 + 8361605^2 .

It is a cyclic number.

It is not a de Polignac number, because 100121201101021 - 2²⁹ = 100120664230109 is a prime.

It is a super-2 number, since 2×100121201101021² (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 = 100121201100992 and 100121201101010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100121201105021) 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, 944539632976 + ... + 944539633081.

It is an arithmetic number, because the mean of its divisors is an integer number (25502570091783).

Almost surely, 2^{100121201101021} is an apocalyptic number.

It is an amenable number.

100121201101021 is a deficient number, since it is larger than the sum of its proper divisors (1889079266111).

100121201101021 is an equidigital number, since it uses as much as digits as its factorization.

100121201101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1889079266110.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 100121201101021 its reverse (120101102121001), we get a palindrome (220222303222022).

The spelling of 100121201101021 in words is "one hundred trillion, one hundred twenty-one billion, two hundred one million, one hundred one thousand, twenty-one".