21002100101121 has 8 divisors (see below), whose sum is σ = 28002828428064. Its totient is φ = 14001385920800.

The previous prime is 21002100101113. The next prime is 21002100101179. The reversal of 21002100101121 is 12110100120012.

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 21002100101121 - 2³ = 21002100101113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21002100101097 and 21002100101106.

It is not an unprimeable number, because it can be changed into a prime (21002100101111) 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, 628021 + ... + 6511421.

It is an arithmetic number, because the mean of its divisors is an integer number (3500353553508).

Almost surely, 2^{21002100101121} is an apocalyptic number.

It is an amenable number.

21002100101121 is a deficient number, since it is larger than the sum of its proper divisors (7000728326943).

21002100101121 is a wasteful number, since it uses less digits than its factorization.

21002100101121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7073311.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21002100101121 its reverse (12110100120012), we get a palindrome (33112200221133).

The spelling of 21002100101121 in words is "twenty-one trillion, two billion, one hundred million, one hundred one thousand, one hundred twenty-one".