21110001012121 has 8 divisors (see below), whose sum is σ = 24131232448704. Its totient is φ = 18090148827120.

The previous prime is 21110001012091. The next prime is 21110001012127. The reversal of 21110001012121 is 12121010001112.

It is a happy number.

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 21110001012121 - 2⁹ = 21110001011609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21110001012127) 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, 344780095 + ... + 344841316.

It is an arithmetic number, because the mean of its divisors is an integer number (3016404056088).

Almost surely, 2^{21110001012121} is an apocalyptic number.

It is an amenable number.

21110001012121 is a deficient number, since it is larger than the sum of its proper divisors (3021231436583).

21110001012121 is an equidigital number, since it uses as much as digits as its factorization.

21110001012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689625791.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21110001012121 its reverse (12121010001112), we get a palindrome (33231011013233).

The spelling of 21110001012121 in words is "twenty-one trillion, one hundred ten billion, one million, twelve thousand, one hundred twenty-one".