1020211111 has 4 divisors (see below), whose sum is σ = 1025338000. Its totient is φ = 1015084224.

The previous prime is 1020211063. The next prime is 1020211117. The reversal of 1020211111 is 1111120201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1111120201 = 3259 ⋅340939.

It is a cyclic number.

It is not a de Polignac number, because 1020211111 - 2¹¹ = 1020209063 is a prime.

It is a super-2 number, since 2×1020211111² = 2081661422015708642, which contains 22 as substring.

It is a Duffinian number.

1020211111 is a modest number, since divided by 11111 gives 10202 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020211117) 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, 2563146 + ... + 2563543.

It is an arithmetic number, because the mean of its divisors is an integer number (256334500).

Almost surely, 2^1020211111 is an apocalyptic number.

1020211111 is a deficient number, since it is larger than the sum of its proper divisors (5126889).

1020211111 is an equidigital number, since it uses as much as digits as its factorization.

1020211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5126888.

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 1020211111 is about 31940.7437452543. The cubic root of 1020211111 is about 1006.6921521965.

Adding to 1020211111 its reverse (1111120201), we get a palindrome (2131331312).

The spelling of 1020211111 in words is "one billion, twenty million, two hundred eleven thousand, one hundred eleven".