21012202111201 has 24 divisors (see below), whose sum is σ = 24512622959880. Its totient is φ = 17959021516800.

The previous prime is 21012202111183. The next prime is 21012202111231. The reversal of 21012202111201 is 10211120221012.

It can be written as a sum of positive squares in 4 ways, for example, as 877022885025 + 20135179226176 = 936495^2 + 4487224^2 .

It is not a de Polignac number, because 21012202111201 - 2²³ = 21012193722593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21012202111231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48705321 + ... + 49134841.

It is an arithmetic number, because the mean of its divisors is an integer number (1021359289995).

Almost surely, 2^{21012202111201} is an apocalyptic number.

It is an amenable number.

21012202111201 is a deficient number, since it is larger than the sum of its proper divisors (3500420848679).

21012202111201 is a wasteful number, since it uses less digits than its factorization.

21012202111201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432385 (or 432378 counting only the distinct ones).

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

Adding to 21012202111201 its reverse (10211120221012), we get a palindrome (31223322332213).

The spelling of 21012202111201 in words is "twenty-one trillion, twelve billion, two hundred two million, one hundred eleven thousand, two hundred one".