521721922034 has 16 divisors (see below), whose sum is σ = 796055357976. Its totient is φ = 256377052800.

The previous prime is 521721922027. The next prime is 521721922039. The reversal of 521721922034 is 430229127125.

It can be written as a sum of positive squares in 4 ways, for example, as 215298784009 + 306423138025 = 464003^2 + 553555^2 .

It is not an unprimeable number, because it can be changed into a prime (521721922039) 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, 1577627 + ... + 1879454.

Almost surely, 2^521721922034 is an apocalyptic number.

521721922034 is a deficient number, since it is larger than the sum of its proper divisors (274333435942).

521721922034 is a wasteful number, since it uses less digits than its factorization.

521721922034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3458381.

The product of its (nonzero) digits is 60480, while the sum is 38.

The spelling of 521721922034 in words is "five hundred twenty-one billion, seven hundred twenty-one million, nine hundred twenty-two thousand, thirty-four".