10211020212221 has 4 divisors (see below), whose sum is σ = 10563124357500. Its totient is φ = 9858916066944.

The previous prime is 10211020212179. The next prime is 10211020212251. The reversal of 10211020212221 is 12221202011201.

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 6808895296996 + 3402124915225 = 2609386^2 + 1844485^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10211020212221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10211020212221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10211020212251) 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, 176052072596 + ... + 176052072653.

It is an arithmetic number, because the mean of its divisors is an integer number (2640781089375).

Almost surely, 2^{10211020212221} is an apocalyptic number.

It is an amenable number.

10211020212221 is a deficient number, since it is larger than the sum of its proper divisors (352104145279).

10211020212221 is an equidigital number, since it uses as much as digits as its factorization.

10211020212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352104145278.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 10211020212221 its reverse (12221202011201), we get a palindrome (22432222223422).

The spelling of 10211020212221 in words is "ten trillion, two hundred eleven billion, twenty million, two hundred twelve thousand, two hundred twenty-one".