10211021212221 has 8 divisors (see below), whose sum is σ = 15127438832960. Its totient is φ = 6807347474796.

The previous prime is 10211021212193. The next prime is 10211021212229. The reversal of 10211021212221 is 12221212011201.

10211021212221 is a `hidden beast` number, since 1 + 0 + 211 + 0 + 21 + 212 + 221 = 666.

It is not a de Polignac number, because 10211021212221 - 2⁶ = 10211021212157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10211021212194 and 10211021212203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10211021212229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189092985385 + ... + 189092985438.

It is an arithmetic number, because the mean of its divisors is an integer number (1890929854120).

Almost surely, 2^{10211021212221} is an apocalyptic number.

It is an amenable number.

10211021212221 is a deficient number, since it is larger than the sum of its proper divisors (4916417620739).

10211021212221 is an equidigital number, since it uses as much as digits as its factorization.

10211021212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378185970832 (or 378185970826 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 10211021212221 its reverse (12221212011201), we get a palindrome (22432233223422).

The spelling of 10211021212221 in words is "ten trillion, two hundred eleven billion, twenty-one million, two hundred twelve thousand, two hundred twenty-one".