261021132435 has 32 divisors (see below), whose sum is σ = 477726382080. Its totient is φ = 119216297088.

The previous prime is 261021132409. The next prime is 261021132451. The reversal of 261021132435 is 534231120162.

It is not a de Polignac number, because 261021132435 - 2¹⁸ = 261020870291 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1004347 + ... + 1237236.

It is an arithmetic number, because the mean of its divisors is an integer number (14928949440).

Almost surely, 2^261021132435 is an apocalyptic number.

261021132435 is a deficient number, since it is larger than the sum of its proper divisors (216705249645).

261021132435 is a wasteful number, since it uses less digits than its factorization.

261021132435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2242707.

The product of its (nonzero) digits is 8640, while the sum is 30.

Adding to 261021132435 its reverse (534231120162), we get a palindrome (795252252597).

The spelling of 261021132435 in words is "two hundred sixty-one billion, twenty-one million, one hundred thirty-two thousand, four hundred thirty-five".