2111121020 has 12 divisors (see below), whose sum is σ = 4433354184. Its totient is φ = 844448400.

The previous prime is 2111121017. The next prime is 2111121071. The reversal of 2111121020 is 201211112.

It is a super-2 number, since 2×2111121020² = 8913663922171680800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2111120992 and 2111121010.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52778006 + ... + 52778045.

It is an arithmetic number, because the mean of its divisors is an integer number (369446182).

Almost surely, 2^2111121020 is an apocalyptic number.

2111121020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2111121020 is an abundant number, since it is smaller than the sum of its proper divisors (2322233164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2111121020 is a wasteful number, since it uses less digits than its factorization.

2111121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105556060 (or 105556058 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 2111121020 is about 45946.9370034609. The cubic root of 2111121020 is about 1282.8357174946.

Adding to 2111121020 its reverse (201211112), we get a palindrome (2312332132).

The spelling of 2111121020 in words is "two billion, one hundred eleven million, one hundred twenty-one thousand, twenty".