521640106221 has 16 divisors (see below), whose sum is σ = 757437670080. Its totient is φ = 317402448000.

The previous prime is 521640106199. The next prime is 521640106241. The reversal of 521640106221 is 122601046125.

It is not a de Polignac number, because 521640106221 - 2⁷ = 521640106093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521640106241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75139155 + ... + 75146096.

It is an arithmetic number, because the mean of its divisors is an integer number (47339854380).

Almost surely, 2^521640106221 is an apocalyptic number.

It is an amenable number.

521640106221 is a deficient number, since it is larger than the sum of its proper divisors (235797563859).

521640106221 is a wasteful number, since it uses less digits than its factorization.

521640106221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150285356.

The product of its (nonzero) digits is 5760, while the sum is 30.

The spelling of 521640106221 in words is "five hundred twenty-one billion, six hundred forty million, one hundred six thousand, two hundred twenty-one".