102021221111 has 4 divisors (see below), whose sum is σ = 102171917832. Its totient is φ = 101870524392.

The previous prime is 102021221051. The next prime is 102021221119. The reversal of 102021221111 is 111122120201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111122120201 = 10589 ⋅10494109.

It is a cyclic number.

It is not a de Polignac number, because 102021221111 - 2¹⁰ = 102021220087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102021221119) 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, 75347345 + ... + 75348698.

It is an arithmetic number, because the mean of its divisors is an integer number (25542979458).

Almost surely, 2^102021221111 is an apocalyptic number.

102021221111 is a deficient number, since it is larger than the sum of its proper divisors (150696721).

102021221111 is an equidigital number, since it uses as much as digits as its factorization.

102021221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150696720.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 102021221111 its reverse (111122120201), we get a palindrome (213143341312).

The spelling of 102021221111 in words is "one hundred two billion, twenty-one million, two hundred twenty-one thousand, one hundred eleven".