21120000121 has 8 divisors (see below), whose sum is σ = 23251377600. Its totient is φ = 19023852240.

The previous prime is 21120000103. The next prime is 21120000131. The reversal of 21120000121 is 12100002112.

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 21120000121 - 2⁵ = 21120000089 is a prime.

It is a super-2 number, since 2×21120000121² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21120000098 and 21120000107.

It is not an unprimeable number, because it can be changed into a prime (21120000131) 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, 8806141 + ... + 8808538.

It is an arithmetic number, because the mean of its divisors is an integer number (2906422200).

Almost surely, 2^21120000121 is an apocalyptic number.

It is an amenable number.

21120000121 is a deficient number, since it is larger than the sum of its proper divisors (2131377479).

21120000121 is a wasteful number, since it uses less digits than its factorization.

21120000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17614799.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21120000121 its reverse (12100002112), we get a palindrome (33220002233).

The spelling of 21120000121 in words is "twenty-one billion, one hundred twenty million, one hundred twenty-one", and thus it is an aban number.