102021111211 has 4 divisors (see below), whose sum is σ = 107390643400. Its totient is φ = 96651579024.

The previous prime is 102021111191. The next prime is 102021111239. The reversal of 102021111211 is 112111120201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 112111120201 = 47 ⋅2385342983.

It is a cyclic number.

It is not a de Polignac number, because 102021111211 - 2⁹ = 102021110699 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102021111191 and 102021111200.

It is not an unprimeable number, because it can be changed into a prime (102021111281) 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, 2684766066 + ... + 2684766103.

It is an arithmetic number, because the mean of its divisors is an integer number (26847660850).

Almost surely, 2^102021111211 is an apocalyptic number.

102021111211 is a deficient number, since it is larger than the sum of its proper divisors (5369532189).

102021111211 is an equidigital number, since it uses as much as digits as its factorization.

102021111211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5369532188.

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

Adding to 102021111211 its reverse (112111120201), we get a palindrome (214132231412).

The spelling of 102021111211 in words is "one hundred two billion, twenty-one million, one hundred eleven thousand, two hundred eleven".