1620021513 has 16 divisors (see below), whose sum is σ = 2357496000. Its totient is φ = 981372480.

The previous prime is 1620021503. The next prime is 1620021527. The reversal of 1620021513 is 3151200261.

It is not a de Polignac number, because 1620021513 - 2¹⁴ = 1620005129 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1620021513.

It is not an unprimeable number, because it can be changed into a prime (1620021503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68563 + ... + 89111.

It is an arithmetic number, because the mean of its divisors is an integer number (147343500).

Almost surely, 2^1620021513 is an apocalyptic number.

It is an amenable number.

1620021513 is a deficient number, since it is larger than the sum of its proper divisors (737474487).

1620021513 is a wasteful number, since it uses less digits than its factorization.

1620021513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22952.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 1620021513 is about 40249.4908415001. The cubic root of 1620021513 is about 1174.4654911269.

Adding to 1620021513 its reverse (3151200261), we get a palindrome (4771221774).

The spelling of 1620021513 in words is "one billion, six hundred twenty million, twenty-one thousand, five hundred thirteen".