21221200101012 has 24 divisors (see below), whose sum is σ = 50854407450336. Its totient is φ = 6882551383968.

The previous prime is 21221200100959. The next prime is 21221200101029. The reversal of 21221200101012 is 21010100212212.

It is a junction number, because it is equal to n+sod(n) for n = 21221200100982 and 21221200101000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23897747418 + ... + 23897748305.

It is an arithmetic number, because the mean of its divisors is an integer number (2118933643764).

Almost surely, 2^{21221200101012} is an apocalyptic number.

It is an amenable number.

21221200101012 is an abundant number, since it is smaller than the sum of its proper divisors (29633207349324).

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

21221200101012 is a wasteful number, since it uses less digits than its factorization.

21221200101012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47795495767 (or 47795495765 counting only the distinct ones).

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

Adding to 21221200101012 its reverse (21010100212212), we get a palindrome (42231300313224).

The spelling of 21221200101012 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred million, one hundred one thousand, twelve".