21121121210001 has 8 divisors (see below), whose sum is σ = 28161872942304. Its totient is φ = 14080558475520.

The previous prime is 21121121209987. The next prime is 21121121210003. The reversal of 21121121210001 is 10001212112112.

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 21121121210001 - 2¹⁷ = 21121121078929 is a prime.

It is a super-2 number, since 2×21121121210001² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121121210003) 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, 46988491 + ... + 47435856.

It is an arithmetic number, because the mean of its divisors is an integer number (3520234117788).

Almost surely, 2^{21121121210001} is an apocalyptic number.

It is an amenable number.

21121121210001 is a deficient number, since it is larger than the sum of its proper divisors (7040751732303).

21121121210001 is an equidigital number, since it uses as much as digits as its factorization.

21121121210001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94498911.

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

Adding to 21121121210001 its reverse (10001212112112), we get a palindrome (31122333322113).

The spelling of 21121121210001 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred twenty-one million, two hundred ten thousand, one".