21112112220001 has 6 divisors (see below), whose sum is σ = 23205875415506. Its totient is φ = 19192829290800.

The previous prime is 21112112219963. The next prime is 21112112220037. The reversal of 21112112220001 is 10002221121112.

It can be written as a sum of positive squares in only one way, i.e., 21062372069376 + 49740150625 = 4589376^2 + 223025^2 .

It is not a de Polignac number, because 21112112220001 - 2¹⁷ = 21112112088929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112112220301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 87240133020 + ... + 87240133261.

Almost surely, 2^{21112112220001} is an apocalyptic number.

It is an amenable number.

21112112220001 is a deficient number, since it is larger than the sum of its proper divisors (2093763195505).

21112112220001 is a wasteful number, since it uses less digits than its factorization.

21112112220001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174480266303 (or 174480266292 counting only the distinct ones).

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

Adding to 21112112220001 its reverse (10002221121112), we get a palindrome (31114333341113).

It can be divided in two parts, 2111 and 2112220001, that added together give a palindrome (2112222112).

The spelling of 21112112220001 in words is "twenty-one trillion, one hundred twelve billion, one hundred twelve million, two hundred twenty thousand, one".