21121300024 has 32 divisors (see below), whose sum is σ = 43934918400. Its totient is φ = 9437866720.

The previous prime is 21121300007. The next prime is 21121300043. The reversal of 21121300024 is 42000312112.

It is a super-2 number, since 2×21121300024² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121299980 and 21121300007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2028832 + ... + 2039215.

It is an arithmetic number, because the mean of its divisors is an integer number (1372966200).

Almost surely, 2^21121300024 is an apocalyptic number.

It is an amenable number.

21121300024 is an abundant number, since it is smaller than the sum of its proper divisors (22813618376).

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

21121300024 is a wasteful number, since it uses less digits than its factorization.

21121300024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4068123 (or 4068119 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21121300024 its reverse (42000312112), we get a palindrome (63121612136).

The spelling of 21121300024 in words is "twenty-one billion, one hundred twenty-one million, three hundred thousand, twenty-four".