100121011021 has 4 divisors (see below), whose sum is σ = 100123643232. Its totient is φ = 100118378812.

The previous prime is 100121010973. The next prime is 100121011049. The reversal of 100121011021 is 120110121001.

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, and also an emirpimes, since its reverse is a distinct semiprime: 120110121001 = 13 ⋅9239240077.

It is a cyclic number.

It is not a de Polignac number, because 100121011021 - 2²⁵ = 100087456589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100121010989 and 100121011007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100121011091) 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, 1258201 + ... + 1335406.

It is an arithmetic number, because the mean of its divisors is an integer number (25030910808).

Almost surely, 2^100121011021 is an apocalyptic number.

It is an amenable number.

100121011021 is a deficient number, since it is larger than the sum of its proper divisors (2632211).

100121011021 is an equidigital number, since it uses as much as digits as its factorization.

100121011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2632210.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 100121011021 its reverse (120110121001), we get a palindrome (220231132022).

The spelling of 100121011021 in words is "one hundred billion, one hundred twenty-one million, eleven thousand, twenty-one".