139829204821 has 2 divisors, whose sum is σ = 139829204822. Its totient is φ = 139829204820.

The previous prime is 139829204791. The next prime is 139829204887. The reversal of 139829204821 is 128402928931.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124387414596 + 15441790225 = 352686^2 + 124265^2 .

It is an emirp because it is prime and its reverse (128402928931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139829204821 - 2⁹ = 139829204309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139829201821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69914602410 + 69914602411.

It is an arithmetic number, because the mean of its divisors is an integer number (69914602411).

Almost surely, 2^139829204821 is an apocalyptic number.

It is an amenable number.

139829204821 is a deficient number, since it is larger than the sum of its proper divisors (1).

139829204821 is an equidigital number, since it uses as much as digits as its factorization.

139829204821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 497664, while the sum is 49.

The spelling of 139829204821 in words is "one hundred thirty-nine billion, eight hundred twenty-nine million, two hundred four thousand, eight hundred twenty-one".