21034430212 has 36 divisors (see below), whose sum is σ = 38877366556. Its totient is φ = 9956136960.

The previous prime is 21034430171. The next prime is 21034430227. The reversal of 21034430212 is 21203443012.

It can be written as a sum of positive squares in 2 ways, for example, as 17114918976 + 3919511236 = 130824^2 + 62606^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 154012 + ... + 256492.

Almost surely, 2^21034430212 is an apocalyptic number.

It is an amenable number.

21034430212 is a deficient number, since it is larger than the sum of its proper divisors (17842936344).

21034430212 is a wasteful number, since it uses less digits than its factorization.

21034430212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102628 (or 102603 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21034430212 its reverse (21203443012), we get a palindrome (42237873224).

The spelling of 21034430212 in words is "twenty-one billion, thirty-four million, four hundred thirty thousand, two hundred twelve".