521721770122 has 16 divisors (see below), whose sum is σ = 902585502720. Its totient is φ = 221543713008.

The previous prime is 521721770107. The next prime is 521721770123. The reversal of 521721770122 is 221077127125.

It is a super-4 number, since 4×521721770122⁴ (a number of 48 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (521721770123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170942698 + ... + 170945749.

It is an arithmetic number, because the mean of its divisors is an integer number (56411593920).

Almost surely, 2^521721770122 is an apocalyptic number.

521721770122 is a deficient number, since it is larger than the sum of its proper divisors (380863732598).

521721770122 is a wasteful number, since it uses less digits than its factorization.

521721770122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341888565.

The product of its (nonzero) digits is 27440, while the sum is 37.

Adding to 521721770122 its reverse (221077127125), we get a palindrome (742798897247).

The spelling of 521721770122 in words is "five hundred twenty-one billion, seven hundred twenty-one million, seven hundred seventy thousand, one hundred twenty-two".