2021100020121 has 32 divisors (see below), whose sum is σ = 3318022478848. Its totient is φ = 1065642246720.

The previous prime is 2021100020117. The next prime is 2021100020129. The reversal of 2021100020121 is 1210200011202.

It is not a de Polignac number, because 2021100020121 - 2² = 2021100020117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021100020097 and 2021100020106.

It is not an unprimeable number, because it can be changed into a prime (2021100020129) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 826975 + ... + 2173956.

It is an arithmetic number, because the mean of its divisors is an integer number (103688202464).

Almost surely, 2^{2021100020121} is an apocalyptic number.

2021100020121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2021100020121 is a deficient number, since it is larger than the sum of its proper divisors (1296922458727).

2021100020121 is a wasteful number, since it uses less digits than its factorization.

2021100020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3003421.

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

Adding to 2021100020121 its reverse (1210200011202), we get a palindrome (3231300031323).

The spelling of 2021100020121 in words is "two trillion, twenty-one billion, one hundred million, twenty thousand, one hundred twenty-one".