1621463321353 has 2 divisors, whose sum is σ = 1621463321354. Its totient is φ = 1621463321352.

The previous prime is 1621463321327. The next prime is 1621463321393. The reversal of 1621463321353 is 3531233641261.

It is an a-pointer prime, because the next prime (1621463321393) can be obtained adding 1621463321353 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 815495690304 + 805967631049 = 903048^2 + 897757^2 .

It is a cyclic number.

It is not a de Polignac number, because 1621463321353 - 2⁵ = 1621463321321 is a prime.

It is not a weakly prime, because it can be changed into another prime (1621463321393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810731660676 + 810731660677.

It is an arithmetic number, because the mean of its divisors is an integer number (810731660677).

Almost surely, 2^{1621463321353} is an apocalyptic number.

It is an amenable number.

1621463321353 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621463321353 is an equidigital number, since it uses as much as digits as its factorization.

1621463321353 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 40.

The spelling of 1621463321353 in words is "one trillion, six hundred twenty-one billion, four hundred sixty-three million, three hundred twenty-one thousand, three hundred fifty-three".