21002211211201 has 6 divisors (see below), whose sum is σ = 23085075133106. Its totient is φ = 19092919282800.

The previous prime is 21002211211199. The next prime is 21002211211291. The reversal of 21002211211201 is 10211211220012.

It can be written as a sum of positive squares in only one way, i.e., 18646980786225 + 2355230424976 = 4318215^2 + 1534676^2 .

It is not a de Polignac number, because 21002211211201 - 2¹ = 21002211211199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002211211291) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 86785996620 + ... + 86785996861.

Almost surely, 2^{21002211211201} is an apocalyptic number.

It is an amenable number.

21002211211201 is a deficient number, since it is larger than the sum of its proper divisors (2082863921905).

21002211211201 is a wasteful number, since it uses less digits than its factorization.

21002211211201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173571993503 (or 173571993492 counting only the distinct ones).

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

Adding to 21002211211201 its reverse (10211211220012), we get a palindrome (31213422431213).

The spelling of 21002211211201 in words is "twenty-one trillion, two billion, two hundred eleven million, two hundred eleven thousand, two hundred one".