102021211111111 has 4 divisors (see below), whose sum is σ = 102021553885032. Its totient is φ = 102020868337192.

The previous prime is 102021211111093. The next prime is 102021211111121. The reversal of 102021211111111 is 111111112120201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 102021211111111 - 2⁷ = 102021211110983 is a prime.

It is a Duffinian number.

102021211111111 is a modest number, since divided by 11111111 gives 1020212 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102021211111121) 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, 170940121 + ... + 171535906.

It is an arithmetic number, because the mean of its divisors is an integer number (25505388471258).

Almost surely, 2^{102021211111111} is an apocalyptic number.

102021211111111 is a deficient number, since it is larger than the sum of its proper divisors (342773921).

102021211111111 is an equidigital number, since it uses as much as digits as its factorization.

102021211111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342773920.

The product of its (nonzero) digits is 8, while the sum is 16.

Adding to 102021211111111 its reverse (111111112120201), we get a palindrome (213132323231312).

The spelling of 102021211111111 in words is "one hundred two trillion, twenty-one billion, two hundred eleven million, one hundred eleven thousand, one hundred eleven".