102211022021 has 4 divisors (see below), whose sum is σ = 102301555500. Its totient is φ = 102120488544.

The previous prime is 102211022009. The next prime is 102211022057. The reversal of 102211022021 is 120220112201.

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 48055216225 + 54155805796 = 219215^2 + 232714^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102211022021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102211021987 and 102211022005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102211024021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45265046 + ... + 45267303.

It is an arithmetic number, because the mean of its divisors is an integer number (25575388875).

Almost surely, 2^102211022021 is an apocalyptic number.

It is an amenable number.

102211022021 is a deficient number, since it is larger than the sum of its proper divisors (90533479).

102211022021 is an equidigital number, since it uses as much as digits as its factorization.

102211022021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90533478.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 102211022021 its reverse (120220112201), we get a palindrome (222431134222).

The spelling of 102211022021 in words is "one hundred two billion, two hundred eleven million, twenty-two thousand, twenty-one".