243520421002 has 4 divisors (see below), whose sum is σ = 365280631506. Its totient is φ = 121760210500.

The previous prime is 243520420961. The next prime is 243520421003. The reversal of 243520421002 is 200124025342.

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

It can be written as a sum of positive squares in only one way, i.e., 124059632841 + 119460788161 = 352221^2 + 345631^2 .

It is not an unprimeable number, because it can be changed into a prime (243520421003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60880105249 + ... + 60880105252.

Almost surely, 2^243520421002 is an apocalyptic number.

243520421002 is a deficient number, since it is larger than the sum of its proper divisors (121760210504).

243520421002 is a wasteful number, since it uses less digits than its factorization.

243520421002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121760210503.

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 243520421002 its reverse (200124025342), we get a palindrome (443644446344).

The spelling of 243520421002 in words is "two hundred forty-three billion, five hundred twenty million, four hundred twenty-one thousand, two".