21221002101012 has 96 divisors (see below), whose sum is σ = 60069052447488. Its totient is φ = 5692113782784.

The previous prime is 21221002100929. The next prime is 21221002101023. The reversal of 21221002101012 is 21010120012212.

It is a junction number, because it is equal to n+sod(n) for n = 21221002100982 and 21221002101000.

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 31 ways as a sum of consecutive naturals, for example, 18149263 + ... + 19283094.

It is an arithmetic number, because the mean of its divisors is an integer number (625719296328).

Almost surely, 2^{21221002101012} is an apocalyptic number.

It is an amenable number.

21221002101012 is an abundant number, since it is smaller than the sum of its proper divisors (38848050346476).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21221002101012 is a wasteful number, since it uses less digits than its factorization.

21221002101012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37432785 (or 37432783 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21221002101012 its reverse (21010120012212), we get a palindrome (42231122113224).

The spelling of 21221002101012 in words is "twenty-one trillion, two hundred twenty-one billion, two million, one hundred one thousand, twelve".