261421333 has 4 divisors (see below), whose sum is σ = 261491200. Its totient is φ = 261351468.

The previous prime is 261421309. The next prime is 261421343. The reversal of 261421333 is 333124162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261421333 - 2⁵ = 261421301 is a prime.

It is a super-2 number, since 2×261421333² = 136682226694993778, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261421298 and 261421307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261421343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28983 + ... + 36916.

It is an arithmetic number, because the mean of its divisors is an integer number (65372800).

Almost surely, 2^261421333 is an apocalyptic number.

It is an amenable number.

261421333 is a deficient number, since it is larger than the sum of its proper divisors (69867).

261421333 is an equidigital number, since it uses as much as digits as its factorization.

261421333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69866.

The product of its digits is 2592, while the sum is 25.

The square root of 261421333 is about 16168.5290920356. The cubic root of 261421333 is about 639.4113508373.

Adding to 261421333 its reverse (333124162), we get a palindrome (594545495).

The spelling of 261421333 in words is "two hundred sixty-one million, four hundred twenty-one thousand, three hundred thirty-three".