521721770119 has 4 divisors (see below), whose sum is σ = 569151021960. Its totient is φ = 474292518280.

The previous prime is 521721770107. The next prime is 521721770123. The reversal of 521721770119 is 911077127125.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 521721770119 - 2¹³ = 521721761927 is a prime.

It is a super-2 number, since 2×521721770119² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521721770159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23714625904 + ... + 23714625925.

It is an arithmetic number, because the mean of its divisors is an integer number (142287755490).

Almost surely, 2^521721770119 is an apocalyptic number.

521721770119 is a deficient number, since it is larger than the sum of its proper divisors (47429251841).

521721770119 is a wasteful number, since it uses less digits than its factorization.

521721770119 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47429251840.

The product of its (nonzero) digits is 61740, while the sum is 43.

The spelling of 521721770119 in words is "five hundred twenty-one billion, seven hundred twenty-one million, seven hundred seventy thousand, one hundred nineteen".