21121120022021 has 8 divisors (see below), whose sum is σ = 21512303144640. Its totient is φ = 20731043500768.

The previous prime is 21121120022017. The next prime is 21121120022039. The reversal of 21121120022021 is 12022002112112.

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 21121120022021 - 2² = 21121120022017 is a prime.

It is a super-3 number, since 3×21121120022021³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121120024021) 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, 276611816 + ... + 276688161.

It is an arithmetic number, because the mean of its divisors is an integer number (2689037893080).

Almost surely, 2^{21121120022021} is an apocalyptic number.

It is an amenable number.

21121120022021 is a deficient number, since it is larger than the sum of its proper divisors (391183122619).

21121120022021 is an equidigital number, since it uses as much as digits as its factorization.

21121120022021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553300683.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21121120022021 its reverse (12022002112112), we get a palindrome (33143122134133).

The spelling of 21121120022021 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred twenty million, twenty-two thousand, twenty-one".