102211111021 has 4 divisors (see below), whose sum is σ = 107590643200. Its totient is φ = 96831578844.

The previous prime is 102211110997. The next prime is 102211111031. The reversal of 102211111021 is 120111112201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 102211111021 - 2¹¹ = 102211108973 is a prime.

It is a super-2 number, since 2×102211111021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102211110992 and 102211111010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102211111031) 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, 2689766061 + ... + 2689766098.

It is an arithmetic number, because the mean of its divisors is an integer number (26897660800).

Almost surely, 2^102211111021 is an apocalyptic number.

It is an amenable number.

102211111021 is a deficient number, since it is larger than the sum of its proper divisors (5379532179).

102211111021 is an equidigital number, since it uses as much as digits as its factorization.

102211111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5379532178.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 102211111021 its reverse (120111112201), we get a palindrome (222322223222).

The spelling of 102211111021 in words is "one hundred two billion, two hundred eleven million, one hundred eleven thousand, twenty-one".