102021211211111 has 2 divisors, whose sum is σ = 102021211211112. Its totient is φ = 102021211211110.

The previous prime is 102021211211081. The next prime is 102021211211119. The reversal of 102021211211111 is 111112112120201.

It is a strong prime.

It is an emirp because it is prime and its reverse (111112112120201) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102021211211111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 102021211211111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102021211211119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51010605605555 + 51010605605556.

It is an arithmetic number, because the mean of its divisors is an integer number (51010605605556).

Almost surely, 2^{102021211211111} is an apocalyptic number.

102021211211111 is a deficient number, since it is larger than the sum of its proper divisors (1).

102021211211111 is an equidigital number, since it uses as much as digits as its factorization.

102021211211111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 102021211211111 its reverse (111112112120201), we get a palindrome (213133323331312).

The spelling of 102021211211111 in words is "one hundred two trillion, twenty-one billion, two hundred eleven million, two hundred eleven thousand, one hundred eleven".