100121202021 has 16 divisors (see below), whose sum is σ = 140291353664. Its totient is φ = 63433165824.

The previous prime is 100121201987. The next prime is 100121202037. The reversal of 100121202021 is 120202121001.

It is not a de Polignac number, because 100121202021 - 2³¹ = 97973718373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100121201988 and 100121202006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100121202061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10483516 + ... + 10493061.

It is an arithmetic number, because the mean of its divisors is an integer number (8768209604).

Almost surely, 2^100121202021 is an apocalyptic number.

It is an amenable number.

100121202021 is a deficient number, since it is larger than the sum of its proper divisors (40170151643).

100121202021 is a wasteful number, since it uses less digits than its factorization.

100121202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20976660.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 100121202021 its reverse (120202121001), we get a palindrome (220323323022).

It can be divided in two parts, 100 and 121202021, that added together give a palindrome (121202121).

The spelling of 100121202021 in words is "one hundred billion, one hundred twenty-one million, two hundred two thousand, twenty-one".