21101000002101 has 12 divisors (see below), whose sum is σ = 32083391816320. Its totient is φ = 13326947369640.

The previous prime is 21101000002099. The next prime is 21101000002111. The reversal of 21101000002101 is 10120000010112.

It is a happy number.

It is not a de Polignac number, because 21101000002101 - 2¹ = 21101000002099 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101000002111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61698830245 + ... + 61698830586.

Almost surely, 2^{21101000002101} is an apocalyptic number.

It is an amenable number.

21101000002101 is a deficient number, since it is larger than the sum of its proper divisors (10982391814219).

21101000002101 is a wasteful number, since it uses less digits than its factorization.

21101000002101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123397660856 (or 123397660853 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 21101000002101 its reverse (10120000010112), we get a palindrome (31221000012213).

The spelling of 21101000002101 in words is "twenty-one trillion, one hundred one billion, two thousand, one hundred one".