21221122120012 has 48 divisors (see below), whose sum is σ = 39156613816320. Its totient is φ = 10048258584000.

The previous prime is 21221122119983. The next prime is 21221122120013. The reversal of 21221122120012 is 21002122112212.

It is not an unprimeable number, because it can be changed into a prime (21221122120013) 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, 37901314 + ... + 38457142.

It is an arithmetic number, because the mean of its divisors is an integer number (815762787840).

Almost surely, 2^{21221122120012} is an apocalyptic number.

It is an amenable number.

21221122120012 is a deficient number, since it is larger than the sum of its proper divisors (17935491696308).

21221122120012 is a wasteful number, since it uses less digits than its factorization.

21221122120012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562462 (or 562460 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21221122120012 its reverse (21002122112212), we get a palindrome (42223244232224).

The spelling of 21221122120012 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty-two million, one hundred twenty thousand, twelve".