261021124 has 24 divisors (see below), whose sum is σ = 562200128. Its totient is φ = 103260960.

The previous prime is 261021121. The next prime is 261021143. The reversal of 261021124 is 421120162.

It is not an unprimeable number, because it can be changed into a prime (261021121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 358182 + ... + 358909.

Almost surely, 2^261021124 is an apocalyptic number.

It is an amenable number.

261021124 is an abundant number, since it is smaller than the sum of its proper divisors (301179004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261021124 is a wasteful number, since it uses less digits than its factorization.

261021124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717115 (or 717113 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 261021124 is about 16156.1481795631. The cubic root of 261021124 is about 639.0848933264.

Adding to 261021124 its reverse (421120162), we get a palindrome (682141286).

The spelling of 261021124 in words is "two hundred sixty-one million, twenty-one thousand, one hundred twenty-four".