1721420302534 has 4 divisors (see below), whose sum is σ = 2582130453804. Its totient is φ = 860710151266.

The previous prime is 1721420302493. The next prime is 1721420302541. The reversal of 1721420302534 is 4352030241271.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1721420302534.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430355075632 + ... + 430355075635.

It is an arithmetic number, because the mean of its divisors is an integer number (645532613451).

Almost surely, 2^{1721420302534} is an apocalyptic number.

1721420302534 is a deficient number, since it is larger than the sum of its proper divisors (860710151270).

1721420302534 is an equidigital number, since it uses as much as digits as its factorization.

1721420302534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860710151269.

The product of its (nonzero) digits is 40320, while the sum is 34.

The spelling of 1721420302534 in words is "one trillion, seven hundred twenty-one billion, four hundred twenty million, three hundred two thousand, five hundred thirty-four".