10211012012221 has 4 divisors (see below), whose sum is σ = 10211140279132. Its totient is φ = 10210883745312.

The previous prime is 10211012012141. The next prime is 10211012012233. The reversal of 10211012012221 is 12221021011201.

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 5877662023321 + 4333349988900 = 2424389^2 + 2081670^2 .

It is a cyclic number.

It is not a de Polignac number, because 10211012012221 - 2¹⁷ = 10211011881149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10211012012195 and 10211012012204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10211012012261) 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, 64013970 + ... + 64173283.

It is an arithmetic number, because the mean of its divisors is an integer number (2552785069783).

Almost surely, 2^{10211012012221} is an apocalyptic number.

It is an amenable number.

10211012012221 is a deficient number, since it is larger than the sum of its proper divisors (128266911).

10211012012221 is an equidigital number, since it uses as much as digits as its factorization.

10211012012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128266910.

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

Adding to 10211012012221 its reverse (12221021011201), we get a palindrome (22432033023422).

The spelling of 10211012012221 in words is "ten trillion, two hundred eleven billion, twelve million, twelve thousand, two hundred twenty-one".