261220012 has 24 divisors (see below), whose sum is σ = 482865152. Its totient is φ = 123454800.

The previous prime is 261220009. The next prime is 261220019. The reversal of 261220012 is 210022162.

It is not an unprimeable number, because it can be changed into a prime (261220019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19164 + ... + 29827.

Almost surely, 2^261220012 is an apocalyptic number.

It is an amenable number.

261220012 is a deficient number, since it is larger than the sum of its proper divisors (221645140).

261220012 is a wasteful number, since it uses less digits than its factorization.

261220012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49069 (or 49067 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 261220012 is about 16162.3021874979. The cubic root of 261220012 is about 639.2471714397.

Adding to 261220012 its reverse (210022162), we get a palindrome (471242174).

The spelling of 261220012 in words is "two hundred sixty-one million, two hundred twenty thousand, twelve".