21121000212101 has 8 divisors (see below), whose sum is σ = 21164220646944. Its totient is φ = 21077780608080.

The previous prime is 21121000212073. The next prime is 21121000212107. The reversal of 21121000212101 is 10121200012112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21121000212101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121000212107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99383711 + ... + 99596003.

It is an arithmetic number, because the mean of its divisors is an integer number (2645527580868).

Almost surely, 2^{21121000212101} is an apocalyptic number.

It is an amenable number.

21121000212101 is a deficient number, since it is larger than the sum of its proper divisors (43220434843).

21121000212101 is a wasteful number, since it uses less digits than its factorization.

21121000212101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415411.

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

Adding to 21121000212101 its reverse (10121200012112), we get a palindrome (31242200224213).

The spelling of 21121000212101 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twelve thousand, one hundred one".