21032312212 has 48 divisors (see below), whose sum is σ = 39705906240. Its totient is φ = 9711705600.

The previous prime is 21032312201. The next prime is 21032312233. The reversal of 21032312212 is 21221323012.

It is a self number, because there is not a number n which added to its sum of digits gives 21032312212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2286262 + ... + 2295442.

It is an arithmetic number, because the mean of its divisors is an integer number (827206380).

Almost surely, 2^21032312212 is an apocalyptic number.

It is an amenable number.

21032312212 is a deficient number, since it is larger than the sum of its proper divisors (18673594028).

21032312212 is a wasteful number, since it uses less digits than its factorization.

21032312212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9832 (or 9830 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21032312212 its reverse (21221323012), we get a palindrome (42253635224).

The spelling of 21032312212 in words is "twenty-one billion, thirty-two million, three hundred twelve thousand, two hundred twelve".