2122103781 has 24 divisors (see below), whose sum is σ = 3521516544. Its totient is φ = 1206275040.

The previous prime is 2122103779. The next prime is 2122103783. The reversal of 2122103781 is 1873012212.

It is an interprime number because it is at equal distance from previous prime (2122103779) and next prime (2122103783).

It is not a de Polignac number, because 2122103781 - 2¹ = 2122103779 is a prime.

It is a super-2 number, since 2×2122103781² = 9006648914668991922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2122103783) 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, 76146 + ... + 100211.

It is an arithmetic number, because the mean of its divisors is an integer number (146729856).

Almost surely, 2^2122103781 is an apocalyptic number.

2122103781 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2122103781 is a deficient number, since it is larger than the sum of its proper divisors (1399412763).

2122103781 is a wasteful number, since it uses less digits than its factorization.

2122103781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176561 (or 176558 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 2122103781 is about 46066.2976697716. The cubic root of 2122103781 is about 1285.0564517686.

Adding to 2122103781 its reverse (1873012212), we get a palindrome (3995115993).

The spelling of 2122103781 in words is "two billion, one hundred twenty-two million, one hundred three thousand, seven hundred eighty-one".