21201101222012 has 24 divisors (see below), whose sum is σ = 37471892126256. Its totient is φ = 10494969175808.

The previous prime is 21201101221921. The next prime is 21201101222029. The reversal of 21201101222012 is 21022210110212.

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, 14664653 + ... + 16045380.

It is an arithmetic number, because the mean of its divisors is an integer number (1561328838594).

Almost surely, 2^{21201101222012} is an apocalyptic number.

It is an amenable number.

21201101222012 is a deficient number, since it is larger than the sum of its proper divisors (16270790904244).

21201101222012 is a wasteful number, since it uses less digits than its factorization.

21201101222012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30711757 (or 30711755 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21201101222012 its reverse (21022210110212), we get a palindrome (42223311332224).

The spelling of 21201101222012 in words is "twenty-one trillion, two hundred one billion, one hundred one million, two hundred twenty-two thousand, twelve".