1621531245053 has 2 divisors, whose sum is σ = 1621531245054. Its totient is φ = 1621531245052.

The previous prime is 1621531245029. The next prime is 1621531245107. The reversal of 1621531245053 is 3505421351261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1453150688089 + 168380556964 = 1205467^2 + 410342^2 .

It is a cyclic number.

It is not a de Polignac number, because 1621531245053 - 2²⁶ = 1621464136189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1621531244998 and 1621531245016.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1621531245853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810765622526 + 810765622527.

It is an arithmetic number, because the mean of its divisors is an integer number (810765622527).

Almost surely, 2^{1621531245053} is an apocalyptic number.

It is an amenable number.

1621531245053 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621531245053 is an equidigital number, since it uses as much as digits as its factorization.

1621531245053 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108000, while the sum is 38.

The spelling of 1621531245053 in words is "one trillion, six hundred twenty-one billion, five hundred thirty-one million, two hundred forty-five thousand, fifty-three".