2181025105 has 16 divisors (see below), whose sum is σ = 3148548480. Its totient is φ = 1416845952.

The previous prime is 2181025097. The next prime is 2181025111. The reversal of 2181025105 is 5015201812.

It is a cyclic number.

It is not a de Polignac number, because 2181025105 - 2³ = 2181025097 is a prime.

It is a super-2 number, since 2×2181025105² = 9513741017280522050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2181025105.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1639204 + ... + 1640533.

It is an arithmetic number, because the mean of its divisors is an integer number (196784280).

Almost surely, 2^2181025105 is an apocalyptic number.

It is an amenable number.

2181025105 is a deficient number, since it is larger than the sum of its proper divisors (967523375).

2181025105 is a wasteful number, since it uses less digits than its factorization.

2181025105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3279768.

The product of its (nonzero) digits is 800, while the sum is 25.

The square root of 2181025105 is about 46701.4464979405. The cubic root of 2181025105 is about 1296.8414652421.

Adding to 2181025105 its reverse (5015201812), we get a palindrome (7196226917).

The spelling of 2181025105 in words is "two billion, one hundred eighty-one million, twenty-five thousand, one hundred five".