245420021131 has 4 divisors (see below), whose sum is σ = 245952386064. Its totient is φ = 244887656200.

The previous prime is 245420021129. The next prime is 245420021137. The reversal of 245420021131 is 131120024542.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 245420021131 - 2¹ = 245420021129 is a prime.

It is a super-2 number, since 2×245420021131² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 245420021096 and 245420021105.

It is not an unprimeable number, because it can be changed into a prime (245420021137) 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 3 ways as a sum of consecutive naturals, for example, 266181775 + ... + 266182696.

It is an arithmetic number, because the mean of its divisors is an integer number (61488096516).

Almost surely, 2^245420021131 is an apocalyptic number.

245420021131 is a deficient number, since it is larger than the sum of its proper divisors (532364933).

245420021131 is an equidigital number, since it uses as much as digits as its factorization.

245420021131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532364932.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 245420021131 its reverse (131120024542), we get a palindrome (376540045673).

The spelling of 245420021131 in words is "two hundred forty-five billion, four hundred twenty million, twenty-one thousand, one hundred thirty-one".