21121112021001 has 8 divisors (see below), whose sum is σ = 28162000405920. Its totient is φ = 14080482491712.

The previous prime is 21121112020997. The next prime is 21121112021063. The reversal of 21121112021001 is 10012021112112.

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 21121112021001 - 2² = 21121112020997 is a prime.

It is a super-2 number, since 2×21121112021001² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121112031001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64523440 + ... + 64849953.

It is an arithmetic number, because the mean of its divisors is an integer number (3520250050740).

Almost surely, 2^{21121112021001} is an apocalyptic number.

It is an amenable number.

21121112021001 is a deficient number, since it is larger than the sum of its proper divisors (7040888384919).

21121112021001 is a wasteful number, since it uses less digits than its factorization.

21121112021001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129427815.

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

Adding to 21121112021001 its reverse (10012021112112), we get a palindrome (31133133133113).

The spelling of 21121112021001 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred twelve million, twenty-one thousand, one".