21221010101012 has 12 divisors (see below), whose sum is σ = 37745567147316. Its totient is φ = 10436562344640.

The previous prime is 21221010101009. The next prime is 21221010101021. The reversal of 21221010101012 is 21010101012212.

It can be written as a sum of positive squares in 2 ways, for example, as 8357568774916 + 12863441326096 = 2890946^2 + 3586564^2 .

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, 43485676193 + ... + 43485676680.

It is an arithmetic number, because the mean of its divisors is an integer number (3145463928943).

Almost surely, 2^{21221010101012} is an apocalyptic number.

It is an amenable number.

21221010101012 is a deficient number, since it is larger than the sum of its proper divisors (16524557046304).

21221010101012 is a wasteful number, since it uses less digits than its factorization.

21221010101012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86971352938 (or 86971352936 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21221010101012 its reverse (21010101012212), we get a palindrome (42231111113224).

It can be divided in two parts, 212 and 21010101012, that multiplied together give a palindrome (4454141414544).

The spelling of 21221010101012 in words is "twenty-one trillion, two hundred twenty-one billion, ten million, one hundred one thousand, twelve".