1621021000513 has 2 divisors, whose sum is σ = 1621021000514. Its totient is φ = 1621021000512.

The previous prime is 1621021000477. The next prime is 1621021000519. The reversal of 1621021000513 is 3150001201261.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 956742209424 + 664278791089 = 978132^2 + 815033^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1621021000513 is a prime.

It is not a weakly prime, because it can be changed into another prime (1621021000519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810510500256 + 810510500257.

It is an arithmetic number, because the mean of its divisors is an integer number (810510500257).

Almost surely, 2^{1621021000513} is an apocalyptic number.

It is an amenable number.

1621021000513 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621021000513 is an equidigital number, since it uses as much as digits as its factorization.

1621021000513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 22.

Adding to 1621021000513 its reverse (3150001201261), we get a palindrome (4771022201774).

The spelling of 1621021000513 in words is "one trillion, six hundred twenty-one billion, twenty-one million, five hundred thirteen", and thus it is an aban number.