1621535403244 has 24 divisors (see below), whose sum is σ = 2839840174080. Its totient is φ = 810152656464.

The previous prime is 1621535403167. The next prime is 1621535403247. The reversal of 1621535403244 is 4423045351261.

It is a junction number, because it is equal to n+sod(n) for n = 1621535403197 and 1621535403206.

It is not an unprimeable number, because it can be changed into a prime (1621535403247) 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, 53460267 + ... + 53490589.

It is an arithmetic number, because the mean of its divisors is an integer number (118326673920).

Almost surely, 2^{1621535403244} is an apocalyptic number.

It is an amenable number.

1621535403244 is a deficient number, since it is larger than the sum of its proper divisors (1218304770836).

1621535403244 is a wasteful number, since it uses less digits than its factorization.

1621535403244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40029 (or 40027 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 40.

The spelling of 1621535403244 in words is "one trillion, six hundred twenty-one billion, five hundred thirty-five million, four hundred three thousand, two hundred forty-four".