21212331130 has 32 divisors (see below), whose sum is σ = 39125032128. Its totient is φ = 8275536000.

The previous prime is 21212331121. The next prime is 21212331131. The reversal of 21212331130 is 3113321212.

It is a junction number, because it is equal to n+sod(n) for n = 21212331098 and 21212331107.

It is not an unprimeable number, because it can be changed into a prime (21212331131) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2065789 + ... + 2076031.

It is an arithmetic number, because the mean of its divisors is an integer number (1222657254).

Almost surely, 2^21212331130 is an apocalyptic number.

21212331130 is a deficient number, since it is larger than the sum of its proper divisors (17912700998).

21212331130 is a wasteful number, since it uses less digits than its factorization.

21212331130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15342.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21212331130 its reverse (3113321212), we get a palindrome (24325652342).

It can be divided in two parts, 212123 and 31130, that added together give a triangular number (243253 = T₆₉₇).

The spelling of 21212331130 in words is "twenty-one billion, two hundred twelve million, three hundred thirty-one thousand, one hundred thirty".