21035351212 has 48 divisors (see below), whose sum is σ = 38997826560. Its totient is φ = 9900430848.

The previous prime is 21035351189. The next prime is 21035351219. The reversal of 21035351212 is 21215353012.

It is a super-2 number, since 2×21035351212² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21035351219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9253308 + ... + 9255580.

It is an arithmetic number, because the mean of its divisors is an integer number (812454720).

Almost surely, 2^21035351212 is an apocalyptic number.

It is an amenable number.

21035351212 is a deficient number, since it is larger than the sum of its proper divisors (17962475348).

21035351212 is a wasteful number, since it uses less digits than its factorization.

21035351212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3022 (or 3020 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 21035351212 its product of nonzero digits (1800), we get a palindrome (21035353012).

The spelling of 21035351212 in words is "twenty-one billion, thirty-five million, three hundred fifty-one thousand, two hundred twelve".