21221011101012 has 12 divisors (see below), whose sum is σ = 49515692569056. Its totient is φ = 7073670367000.

The previous prime is 21221011100987. The next prime is 21221011101023. The reversal of 21221011101012 is 21010111012212.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 21221011100982 and 21221011101000.

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, 884208795864 + ... + 884208795887.

It is an arithmetic number, because the mean of its divisors is an integer number (4126307714088).

Almost surely, 2^{21221011101012} is an apocalyptic number.

It is an amenable number.

21221011101012 is an abundant number, since it is smaller than the sum of its proper divisors (28294681468044).

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

21221011101012 is a wasteful number, since it uses less digits than its factorization.

21221011101012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1768417591758 (or 1768417591756 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21221011101012 its reverse (21010111012212), we get a palindrome (42231122113224).

The spelling of 21221011101012 in words is "twenty-one trillion, two hundred twenty-one billion, eleven million, one hundred one thousand, twelve".