261421053372003 has 32 divisors (see below), whose sum is σ = 413719145786880. Its totient is φ = 143712966355200.

The previous prime is 261421053371971. The next prime is 261421053372047. The reversal of 261421053372003 is 300273350124162.

It is a happy number.

It is not a de Polignac number, because 261421053372003 - 2⁵ = 261421053371971 is a prime.

It is a super-2 number, since 2×261421053372003² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261421053372503) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1890095073 + ... + 1890233378.

It is an arithmetic number, because the mean of its divisors is an integer number (12928723305840).

Almost surely, 2^{261421053372003} is an apocalyptic number.

261421053372003 is a deficient number, since it is larger than the sum of its proper divisors (152298092414877).

261421053372003 is a wasteful number, since it uses less digits than its factorization.

261421053372003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3780328587.

The product of its (nonzero) digits is 181440, while the sum is 39.

The spelling of 261421053372003 in words is "two hundred sixty-one trillion, four hundred twenty-one billion, fifty-three million, three hundred seventy-two thousand, three".