21012110102121 has 8 divisors (see below), whose sum is σ = 28018719259104. Its totient is φ = 14006787173280.

The previous prime is 21012110102107. The next prime is 21012110102131. The reversal of 21012110102121 is 12120101121012.

It is a happy number.

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

It is not a de Polignac number, because 21012110102121 - 2¹⁰ = 21012110101097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21012110102121.

It is not an unprimeable number, because it can be changed into a prime (21012110102131) 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, 321518916 + ... + 321584261.

It is an arithmetic number, because the mean of its divisors is an integer number (3502339907388).

Almost surely, 2^{21012110102121} is an apocalyptic number.

It is an amenable number.

21012110102121 is a deficient number, since it is larger than the sum of its proper divisors (7006609156983).

21012110102121 is a wasteful number, since it uses less digits than its factorization.

21012110102121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643114071.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21012110102121 its reverse (12120101121012), we get a palindrome (33132211223133).

The spelling of 21012110102121 in words is "twenty-one trillion, twelve billion, one hundred ten million, one hundred two thousand, one hundred twenty-one".