521145231202 has 4 divisors (see below), whose sum is σ = 781717846806. Its totient is φ = 260572615600.

The previous prime is 521145231197. The next prime is 521145231203. The reversal of 521145231202 is 202132541125.

It is a happy number.

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., 315373219561 + 205772011641 = 561581^2 + 453621^2 .

It is not an unprimeable number, because it can be changed into a prime (521145231203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130286307799 + ... + 130286307802.

Almost surely, 2^521145231202 is an apocalyptic number.

521145231202 is a deficient number, since it is larger than the sum of its proper divisors (260572615604).

521145231202 is a wasteful number, since it uses less digits than its factorization.

521145231202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260572615603.

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 521145231202 its reverse (202132541125), we get a palindrome (723277772327).

The spelling of 521145231202 in words is "five hundred twenty-one billion, one hundred forty-five million, two hundred thirty-one thousand, two hundred two".