21210332024 has 16 divisors (see below), whose sum is σ = 45450711600. Its totient is φ = 9090142272.

The previous prime is 21210332009. The next prime is 21210332051. The reversal of 21210332024 is 42023301212.

It is a junction number, because it is equal to n+sod(n) for n = 21210331987 and 21210332005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189377909 + ... + 189378020.

It is an arithmetic number, because the mean of its divisors is an integer number (2840669475).

Almost surely, 2^21210332024 is an apocalyptic number.

It is an amenable number.

21210332024 is an abundant number, since it is smaller than the sum of its proper divisors (24240379576).

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

21210332024 is a wasteful number, since it uses less digits than its factorization.

21210332024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378755942 (or 378755938 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21210332024 its reverse (42023301212), we get a palindrome (63233633236).

The spelling of 21210332024 in words is "twenty-one billion, two hundred ten million, three hundred thirty-two thousand, twenty-four".