521321629979 has 2 divisors, whose sum is σ = 521321629980. Its totient is φ = 521321629978.

The previous prime is 521321629967. The next prime is 521321630003. The reversal of 521321629979 is 979926123125.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 521321629979 - 2¹² = 521321625883 is a prime.

It is a super-2 number, since 2×521321629979² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (521321622979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260660814989 + 260660814990.

It is an arithmetic number, because the mean of its divisors is an integer number (260660814990).

Almost surely, 2^521321629979 is an apocalyptic number.

521321629979 is a deficient number, since it is larger than the sum of its proper divisors (1).

521321629979 is an equidigital number, since it uses as much as digits as its factorization.

521321629979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3674160, while the sum is 56.

The spelling of 521321629979 in words is "five hundred twenty-one billion, three hundred twenty-one million, six hundred twenty-nine thousand, nine hundred seventy-nine".