261121102 has 32 divisors (see below), whose sum is σ = 435456000. Its totient is φ = 116440800.

The previous prime is 261121097. The next prime is 261121103. The reversal of 261121102 is 201121162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261121103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 544899 + ... + 545377.

It is an arithmetic number, because the mean of its divisors is an integer number (13608000).

Almost surely, 2^261121102 is an apocalyptic number.

261121102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

261121102 is a deficient number, since it is larger than the sum of its proper divisors (174334898).

261121102 is a wasteful number, since it uses less digits than its factorization.

261121102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 912.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 261121102 is about 16159.2419995494. The cubic root of 261121102 is about 639.1664783880.

Adding to 261121102 its reverse (201121162), we get a palindrome (462242264).

The spelling of 261121102 in words is "two hundred sixty-one million, one hundred twenty-one thousand, one hundred two".