21303212021212 has 24 divisors (see below), whose sum is σ = 40670946297072. Its totient is φ = 9682997740800.

The previous prime is 21303212021207. The next prime is 21303212021339. The reversal of 21303212021212 is 21212021230312.

It is a super-2 number, since 2×21303212021212² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

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 7 ways as a sum of consecutive naturals, for example, 5470989 + ... + 8516932.

It is an arithmetic number, because the mean of its divisors is an integer number (1694622762378).

Almost surely, 2^{21303212021212} is an apocalyptic number.

21303212021212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21303212021212 is a deficient number, since it is larger than the sum of its proper divisors (19367734275860).

21303212021212 is a wasteful number, since it uses less digits than its factorization.

21303212021212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14022549 (or 14022547 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21303212021212 its reverse (21212021230312), we get a palindrome (42515233251524).

The spelling of 21303212021212 in words is "twenty-one trillion, three hundred three billion, two hundred twelve million, twenty-one thousand, two hundred twelve".