21212131032 has 48 divisors (see below), whose sum is σ = 57603614640. Its totient is φ = 7051745088.

The previous prime is 21212131019. The next prime is 21212131049. The reversal of 21212131032 is 23013121212.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21212130996 and 21212131014.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 368068 + ... + 421779.

It is an arithmetic number, because the mean of its divisors is an integer number (1200075305).

Almost surely, 2^21212131032 is an apocalyptic number.

It is an amenable number.

21212131032 is an abundant number, since it is smaller than the sum of its proper divisors (36391483608).

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

21212131032 is a wasteful number, since it uses less digits than its factorization.

21212131032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790232 (or 790225 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21212131032 its reverse (23013121212), we get a palindrome (44225252244).

The spelling of 21212131032 in words is "twenty-one billion, two hundred twelve million, one hundred thirty-one thousand, thirty-two".