2181025106 has 12 divisors (see below), whose sum is σ = 3542553162. Its totient is φ = 1006626816.

The previous prime is 2181025097. The next prime is 2181025111. The reversal of 2181025106 is 6015201812.

It can be written as a sum of positive squares in 3 ways, for example, as 535505881 + 1645519225 = 23141^2 + 40565^2 .

It is a super-2 number, since 2×2181025106² = 9513741026004622472, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3226031 + ... + 3226706.

Almost surely, 2^2181025106 is an apocalyptic number.

2181025106 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

2181025106 is a deficient number, since it is larger than the sum of its proper divisors (1361528056).

2181025106 is a wasteful number, since it uses less digits than its factorization.

2181025106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6452765 (or 6452752 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 2181025106 is about 46701.4465086468. The cubic root of 2181025106 is about 1296.8414654403.

Adding to 2181025106 its reverse (6015201812), we get a palindrome (8196226918).

The spelling of 2181025106 in words is "two billion, one hundred eighty-one million, twenty-five thousand, one hundred six".