21211322021201 has 4 divisors (see below), whose sum is σ = 22842962176692. Its totient is φ = 19579681865712.

The previous prime is 21211322021167. The next prime is 21211322021237. The reversal of 21211322021201 is 10212022311212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1928473803025 + 19282848218176 = 1388695^2 + 4391224^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21211322021201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21211322021261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 815820077726 + ... + 815820077751.

It is an arithmetic number, because the mean of its divisors is an integer number (5710740544173).

Almost surely, 2^{21211322021201} is an apocalyptic number.

It is an amenable number.

21211322021201 is a deficient number, since it is larger than the sum of its proper divisors (1631640155491).

21211322021201 is a wasteful number, since it uses less digits than its factorization.

21211322021201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1631640155490.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21211322021201 its reverse (10212022311212), we get a palindrome (31423344332413).

The spelling of 21211322021201 in words is "twenty-one trillion, two hundred eleven billion, three hundred twenty-two million, twenty-one thousand, two hundred one".