202421243131 has 4 divisors (see below), whose sum is σ = 207358346664. Its totient is φ = 197484139600.

The previous prime is 202421243119. The next prime is 202421243137. The reversal of 202421243131 is 131342124202.

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 202421243131 - 2¹⁷ = 202421112059 is a prime.

It is a super-2 number, since 2×202421243131² (a number of 23 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 = 202421243096 and 202421243105.

It is not an unprimeable number, because it can be changed into a prime (202421243137) 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, 2468551705 + ... + 2468551786.

It is an arithmetic number, because the mean of its divisors is an integer number (51839586666).

Almost surely, 2^202421243131 is an apocalyptic number.

202421243131 is a deficient number, since it is larger than the sum of its proper divisors (4937103533).

202421243131 is an equidigital number, since it uses as much as digits as its factorization.

202421243131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4937103532.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 202421243131 its reverse (131342124202), we get a palindrome (333763367333).

The spelling of 202421243131 in words is "two hundred two billion, four hundred twenty-one million, two hundred forty-three thousand, one hundred thirty-one".