102211222021 has 4 divisors (see below), whose sum is σ = 102212302444. Its totient is φ = 102210141600.

The previous prime is 102211221977. The next prime is 102211222027. The reversal of 102211222021 is 120222112201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 36495899521 + 65715322500 = 191039^2 + 256350^2 .

It is a cyclic number.

It is not a de Polignac number, because 102211222021 - 2¹³ = 102211213829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102211221986 and 102211222004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102211222027) 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, 383070 + ... + 592591.

It is an arithmetic number, because the mean of its divisors is an integer number (25553075611).

Almost surely, 2^102211222021 is an apocalyptic number.

It is an amenable number.

102211222021 is a deficient number, since it is larger than the sum of its proper divisors (1080423).

102211222021 is an equidigital number, since it uses as much as digits as its factorization.

102211222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080422.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 102211222021 its reverse (120222112201), we get a palindrome (222433334222).

The spelling of 102211222021 in words is "one hundred two billion, two hundred eleven million, two hundred twenty-two thousand, twenty-one".