21000121102101 has 16 divisors (see below), whose sum is σ = 29672164388160. Its totient is φ = 13187628612480.

The previous prime is 21000121102097. The next prime is 21000121102127. The reversal of 21000121102101 is 10120112100012.

It is not a de Polignac number, because 21000121102101 - 2² = 21000121102097 is a prime.

It is a super-2 number, since 2×21000121102101² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000121102141) 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, 2943663535 + ... + 2943670668.

It is an arithmetic number, because the mean of its divisors is an integer number (1854510274260).

Almost surely, 2^{21000121102101} is an apocalyptic number.

It is an amenable number.

21000121102101 is a deficient number, since it is larger than the sum of its proper divisors (8672043286059).

21000121102101 is a wasteful number, since it uses less digits than its factorization.

21000121102101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5887334276.

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

Adding to 21000121102101 its reverse (10120112100012), we get a palindrome (31120233202113).

The spelling of 21000121102101 in words is "twenty-one trillion, one hundred twenty-one million, one hundred two thousand, one hundred one".