102021111111 has 8 divisors (see below), whose sum is σ = 137374961904. Its totient is φ = 67340667200.

The previous prime is 102021111029. The next prime is 102021111139. The reversal of 102021111111 is 111111120201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 102021111111 - 2¹⁹ = 102020586823 is a prime.

It is a super-2 number, since 2×102021111111² (a number of 23 digits) contains 22 as substring.

102021111111 is a modest number, since divided by 111111 gives 102021 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102021111151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 168351366 + ... + 168351971.

It is an arithmetic number, because the mean of its divisors is an integer number (17171870238).

Almost surely, 2^102021111111 is an apocalyptic number.

102021111111 is a deficient number, since it is larger than the sum of its proper divisors (35353850793).

102021111111 is a wasteful number, since it uses less digits than its factorization.

102021111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336703441.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 102021111111 its reverse (111111120201), we get a palindrome (213132231312).

The spelling of 102021111111 in words is "one hundred two billion, twenty-one million, one hundred eleven thousand, one hundred eleven".