21120001002121 has 8 divisors (see below), whose sum is σ = 24141114629120. Its totient is φ = 18099880031808.

The previous prime is 21120001002097. The next prime is 21120001002161. The reversal of 21120001002121 is 12120010002112.

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 21120001002121 - 2¹¹ = 21120001000073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120001002161) 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, 248118576 + ... + 248203681.

It is an arithmetic number, because the mean of its divisors is an integer number (3017639328640).

Almost surely, 2^{21120001002121} is an apocalyptic number.

It is an amenable number.

21120001002121 is a deficient number, since it is larger than the sum of its proper divisors (3021113626999).

21120001002121 is an equidigital number, since it uses as much as digits as its factorization.

21120001002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496328343.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21120001002121 its reverse (12120010002112), we get a palindrome (33240011004233).

The spelling of 21120001002121 in words is "twenty-one trillion, one hundred twenty billion, one million, two thousand, one hundred twenty-one".