1020201111 has 24 divisors (see below), whose sum is σ = 1518109424. Its totient is φ = 659715840.

The previous prime is 1020201109. The next prime is 1020201113. The reversal of 1020201111 is 1111020201.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1020201109) and next prime (1020201113).

It is not a de Polignac number, because 1020201111 - 2¹ = 1020201109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020201093 and 1020201102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020201113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 107676 + ... + 116766.

Almost surely, 2^1020201111 is an apocalyptic number.

1020201111 is a deficient number, since it is larger than the sum of its proper divisors (497908313).

1020201111 is a wasteful number, since it uses less digits than its factorization.

1020201111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9471 (or 9468 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 1020201111 is about 31940.5872049967. The cubic root of 1020201111 is about 1006.6888630229.

Adding to 1020201111 its reverse (1111020201), we get a palindrome (2131221312).

It can be divided in two parts, 1020201 and 111, that multiplied together give a palindrome (113242311).

The spelling of 1020201111 in words is "one billion, twenty million, two hundred one thousand, one hundred eleven".