21130023121 has 8 divisors (see below), whose sum is σ = 21159956480. Its totient is φ = 21100113792.

The previous prime is 21130023091. The next prime is 21130023127. The reversal of 21130023121 is 12132003112.

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 21130023121 - 2⁹ = 21130022609 is a prime.

It is a super-3 number, since 3×21130023121³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21130023095 and 21130023104.

It is not an unprimeable number, because it can be changed into a prime (21130023127) 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, 2361985 + ... + 2370913.

It is an arithmetic number, because the mean of its divisors is an integer number (2644994560).

Almost surely, 2^21130023121 is an apocalyptic number.

It is an amenable number.

21130023121 is a deficient number, since it is larger than the sum of its proper divisors (29933359).

21130023121 is a wasteful number, since it uses less digits than its factorization.

21130023121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12015.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21130023121 its reverse (12132003112), we get a palindrome (33262026233).

The spelling of 21130023121 in words is "twenty-one billion, one hundred thirty million, twenty-three thousand, one hundred twenty-one".