1621003550123 has 8 divisors (see below), whose sum is σ = 1636186128048. Its totient is φ = 1605821583744.

The previous prime is 1621003550113. The next prime is 1621003550141. The reversal of 1621003550123 is 3210553001261.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1621003550123 is a prime.

It is a super-2 number, since 2×1621003550123² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1621003550113) 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, 6537215 + ... + 6780647.

It is an arithmetic number, because the mean of its divisors is an integer number (204523266006).

Almost surely, 2^{1621003550123} is an apocalyptic number.

1621003550123 is a deficient number, since it is larger than the sum of its proper divisors (15182577925).

1621003550123 is a wasteful number, since it uses less digits than its factorization.

1621003550123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305773.

The product of its (nonzero) digits is 5400, while the sum is 29.

Adding to 1621003550123 its reverse (3210553001261), we get a palindrome (4831556551384).

The spelling of 1621003550123 in words is "one trillion, six hundred twenty-one billion, three million, five hundred fifty thousand, one hundred twenty-three".