245434140221 has 4 divisors (see below), whose sum is σ = 247199853600. Its totient is φ = 243668426844.

The previous prime is 245434140187. The next prime is 245434140253. The reversal of 245434140221 is 122041434542.

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 a de Polignac number, because none of the positive numbers 2^k-245434140221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245434140121) 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, 882856481 + ... + 882856758.

It is an arithmetic number, because the mean of its divisors is an integer number (61799963400).

Almost surely, 2^245434140221 is an apocalyptic number.

It is an amenable number.

245434140221 is a deficient number, since it is larger than the sum of its proper divisors (1765713379).

245434140221 is a wasteful number, since it uses less digits than its factorization.

245434140221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1765713378.

The product of its (nonzero) digits is 30720, while the sum is 32.

Adding to 245434140221 its reverse (122041434542), we get a palindrome (367475574763).

The spelling of 245434140221 in words is "two hundred forty-five billion, four hundred thirty-four million, one hundred forty thousand, two hundred twenty-one".