201521322004 has 12 divisors (see below), whose sum is σ = 373407155604. Its totient is φ = 94833563264.

The previous prime is 201521321999. The next prime is 201521322031. The reversal of 201521322004 is 400223125102.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 180499221904 + 21022100100 = 424852^2 + 144990^2 .

It is a super-2 number, since 2×201521322004² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1481774359 + ... + 1481774494.

It is an arithmetic number, because the mean of its divisors is an integer number (31117262967).

Almost surely, 2^201521322004 is an apocalyptic number.

It is an amenable number.

201521322004 is a deficient number, since it is larger than the sum of its proper divisors (171885833600).

201521322004 is a wasteful number, since it uses less digits than its factorization.

201521322004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2963548874 (or 2963548872 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 201521322004 its reverse (400223125102), we get a palindrome (601744447106).

The spelling of 201521322004 in words is "two hundred one billion, five hundred twenty-one million, three hundred twenty-two thousand, four".