21221533017212 has 12 divisors (see below), whose sum is σ = 40513835760216. Its totient is φ = 9646151371440.

The previous prime is 21221533017119. The next prime is 21221533017241. The reversal of 21221533017212 is 21271033512212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 241153784243 + ... + 241153784330.

It is an arithmetic number, because the mean of its divisors is an integer number (3376152980018).

Almost surely, 2^{21221533017212} is an apocalyptic number.

21221533017212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21221533017212 is a deficient number, since it is larger than the sum of its proper divisors (19292302743004).

21221533017212 is a wasteful number, since it uses less digits than its factorization.

21221533017212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482307568588 (or 482307568586 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

Adding to 21221533017212 its reverse (21271033512212), we get a palindrome (42492566529424).

The spelling of 21221533017212 in words is "twenty-one trillion, two hundred twenty-one billion, five hundred thirty-three million, seventeen thousand, two hundred twelve".