651040221321 has 24 divisors (see below), whose sum is σ = 1096666396800. Its totient is φ = 372022981848.

The previous prime is 651040221301. The next prime is 651040221361. The reversal of 651040221321 is 123122040156.

651040221321 is a `hidden beast` number, since 651 + 0 + 4 + 0 + 2 + 2 + 1 + 3 + 2 + 1 = 666.

It is not a de Polignac number, because 651040221321 - 2⁵ = 651040221289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (651040221301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 105445605 + ... + 105451778.

It is an arithmetic number, because the mean of its divisors is an integer number (45694433200).

Almost surely, 2^651040221321 is an apocalyptic number.

It is an amenable number.

651040221321 is a deficient number, since it is larger than the sum of its proper divisors (445626175479).

651040221321 is a wasteful number, since it uses less digits than its factorization.

651040221321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210897410 (or 210897393 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

Adding to 651040221321 its reverse (123122040156), we get a palindrome (774162261477).

The spelling of 651040221321 in words is "six hundred fifty-one billion, forty million, two hundred twenty-one thousand, three hundred twenty-one".