21130031121 has 8 divisors (see below), whose sum is σ = 28248908160. Its totient is φ = 14048920752.

The previous prime is 21130031101. The next prime is 21130031123. The reversal of 21130031121 is 12113003112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21130031121 - 2¹³ = 21130022929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21130031121.

It is not an unprimeable number, because it can be changed into a prime (21130031123) 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, 9440361 + ... + 9442598.

It is an arithmetic number, because the mean of its divisors is an integer number (3531113520).

Almost surely, 2^21130031121 is an apocalyptic number.

It is an amenable number.

21130031121 is a deficient number, since it is larger than the sum of its proper divisors (7118877039).

21130031121 is a wasteful number, since it uses less digits than its factorization.

21130031121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18883335.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21130031121 its reverse (12113003112), we get a palindrome (33243034233).

The spelling of 21130031121 in words is "twenty-one billion, one hundred thirty million, thirty-one thousand, one hundred twenty-one".