21101222211010 has 16 divisors (see below), whose sum is σ = 38178998946936. Its totient is φ = 8396755780608.

The previous prime is 21101222211007. The next prime is 21101222211019. The reversal of 21101222211010 is 1011222210112.

It can be written as a sum of positive squares in 4 ways, for example, as 9345560816601 + 11755661394409 = 3057051^2 + 3428653^2 .

It is not an unprimeable number, because it can be changed into a prime (21101222211019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5466635949 + ... + 5466639808.

Almost surely, 2^{21101222211010} is an apocalyptic number.

21101222211010 is a deficient number, since it is larger than the sum of its proper divisors (17077776735926).

21101222211010 is a wasteful number, since it uses less digits than its factorization.

21101222211010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10933275957.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21101222211010 its reverse (1011222210112), we get a palindrome (22112444421122).

The spelling of 21101222211010 in words is "twenty-one trillion, one hundred one billion, two hundred twenty-two million, two hundred eleven thousand, ten".