21121434124 has 36 divisors (see below), whose sum is σ = 43311108456. Its totient is φ = 8985958464.

The previous prime is 21121434079. The next prime is 21121434133. The reversal of 21121434124 is 42143412112.

It is a super-2 number, since 2×21121434124² (a number of 21 digits) contains 22 as substring.

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 11 ways as a sum of consecutive naturals, for example, 366442 + ... + 420145.

It is an arithmetic number, because the mean of its divisors is an integer number (1203086346).

Almost surely, 2^21121434124 is an apocalyptic number.

It is an amenable number.

21121434124 is an abundant number, since it is smaller than the sum of its proper divisors (22189674332).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21121434124 is a wasteful number, since it uses less digits than its factorization.

21121434124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 786742 (or 786733 counting only the distinct ones).

The product of its digits is 1536, while the sum is 25.

Adding to 21121434124 its reverse (42143412112), we get a palindrome (63264846236).

The spelling of 21121434124 in words is "twenty-one billion, one hundred twenty-one million, four hundred thirty-four thousand, one hundred twenty-four".