100121210021021 has 72 divisors (see below), whose sum is σ = 130325873197824. Its totient is φ = 76346749221120.

The previous prime is 100121210021017. The next prime is 100121210021059. The reversal of 100121210021021 is 120120012121001.

It is not a de Polignac number, because 100121210021021 - 2² = 100121210021017 is a prime.

It is a super-2 number, since 2×100121210021021² (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 = 100121210020987 and 100121210021005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100121210021011) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 46698266 + ... + 48795188.

It is an arithmetic number, because the mean of its divisors is an integer number (1810081572192).

Almost surely, 2^{100121210021021} is an apocalyptic number.

It is an amenable number.

100121210021021 is a deficient number, since it is larger than the sum of its proper divisors (30204663176803).

100121210021021 is a wasteful number, since it uses less digits than its factorization.

100121210021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2097071 (or 2097021 counting only the distinct ones).

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

Adding to 100121210021021 its reverse (120120012121001), we get a palindrome (220241222142022).

The spelling of 100121210021021 in words is "one hundred trillion, one hundred twenty-one billion, two hundred ten million, twenty-one thousand, twenty-one".