21101020020121 has 8 divisors (see below), whose sum is σ = 22753346364000. Its totient is φ = 19502868310560.

The previous prime is 21101020020109. The next prime is 21101020020149. The reversal of 21101020020121 is 12102002010112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21101020020121 - 2¹⁵ = 21101019987353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21101020020151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13543657771 + ... + 13543659328.

It is an arithmetic number, because the mean of its divisors is an integer number (2844168295500).

Almost surely, 2^{21101020020121} is an apocalyptic number.

It is an amenable number.

21101020020121 is a deficient number, since it is larger than the sum of its proper divisors (1652326343879).

21101020020121 is a wasteful number, since it uses less digits than its factorization.

21101020020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27087317159.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21101020020121 its reverse (12102002010112), we get a palindrome (33203022030233).

The spelling of 21101020020121 in words is "twenty-one trillion, one hundred one billion, twenty million, twenty thousand, one hundred twenty-one".