21120300121 has 8 divisors (see below), whose sum is σ = 21364185024. Its totient is φ = 20877813360.

The previous prime is 21120300107. The next prime is 21120300133. The reversal of 21120300121 is 12100302112.

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 21120300121 - 2⁹ = 21120299609 is a prime.

It is a super-2 number, since 2×21120300121² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120301121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319135 + ... + 379588.

It is an arithmetic number, because the mean of its divisors is an integer number (2670523128).

Almost surely, 2^21120300121 is an apocalyptic number.

It is an amenable number.

21120300121 is a deficient number, since it is larger than the sum of its proper divisors (243884903).

21120300121 is a wasteful number, since it uses less digits than its factorization.

21120300121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699071.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21120300121 its reverse (12100302112), we get a palindrome (33220602233).

The spelling of 21120300121 in words is "twenty-one billion, one hundred twenty million, three hundred thousand, one hundred twenty-one".