2051521320244 has 24 divisors (see below), whose sum is σ = 3952472277600. Its totient is φ = 923954554080.

The previous prime is 2051521320217. The next prime is 2051521320287. The reversal of 2051521320244 is 4420231251502.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213873574 + ... + 213883165.

It is an arithmetic number, because the mean of its divisors is an integer number (164686344900).

Almost surely, 2^{2051521320244} is an apocalyptic number.

It is an amenable number.

2051521320244 is a deficient number, since it is larger than the sum of its proper divisors (1900950957356).

2051521320244 is a wasteful number, since it uses less digits than its factorization.

2051521320244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427756863 (or 427756861 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 2051521320244 its reverse (4420231251502), we get a palindrome (6471752571746).

The spelling of 2051521320244 in words is "two trillion, fifty-one billion, five hundred twenty-one million, three hundred twenty thousand, two hundred forty-four".