21121030412 has 24 divisors (see below), whose sum is σ = 37279176480. Its totient is φ = 10470164480.

The previous prime is 21121030393. The next prime is 21121030423. The reversal of 21121030412 is 21403012112.

It is an unprimeable number.

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, 219212 + ... + 300492.

It is an arithmetic number, because the mean of its divisors is an integer number (1553299020).

Almost surely, 2^21121030412 is an apocalyptic number.

It is an amenable number.

21121030412 is a deficient number, since it is larger than the sum of its proper divisors (16158146068).

21121030412 is a wasteful number, since it uses less digits than its factorization.

21121030412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81841 (or 81839 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21121030412 its reverse (21403012112), we get a palindrome (42524042524).

The spelling of 21121030412 in words is "twenty-one billion, one hundred twenty-one million, thirty thousand, four hundred twelve".