1621030073125 has 10 divisors (see below), whose sum is σ = 2025639180158. Its totient is φ = 1296824058000.

The previous prime is 1621030073107. The next prime is 1621030073161. The reversal of 1621030073125 is 5213700301261.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 594129556804 + 1026900516321 = 770798^2 + 1013361^2 .

It is not a de Polignac number, because 1621030073125 - 2⁵ = 1621030073093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1296823434 + ... + 1296824683.

Almost surely, 2^{1621030073125} is an apocalyptic number.

It is an amenable number.

1621030073125 is a deficient number, since it is larger than the sum of its proper divisors (404609107033).

1621030073125 is an frugal number, since it uses more digits than its factorization.

1621030073125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2593648137 (or 2593648122 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 31.

Adding to 1621030073125 its reverse (5213700301261), we get a palindrome (6834730374386).

The spelling of 1621030073125 in words is "one trillion, six hundred twenty-one billion, thirty million, seventy-three thousand, one hundred twenty-five".