20211513 has 16 divisors (see below), whose sum is σ = 30935040. Its totient is φ = 11498256.

The previous prime is 20211493. The next prime is 20211517. The reversal of 20211513 is 31511202.

It is not a de Polignac number, because 20211513 - 2⁵ = 20211481 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20211492 and 20211501.

It is not an unprimeable number, because it can be changed into a prime (20211517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3006 + ... + 7032.

It is an arithmetic number, because the mean of its divisors is an integer number (1933440).

Almost surely, 2^20211513 is an apocalyptic number.

It is an amenable number.

20211513 is a deficient number, since it is larger than the sum of its proper divisors (10723527).

20211513 is a wasteful number, since it uses less digits than its factorization.

20211513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4276.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 20211513 is about 4495.7216328416. The cubic root of 20211513 is about 272.3952991139.

Adding to 20211513 its reverse (31511202), we get a palindrome (51722715).

The spelling of 20211513 in words is "twenty million, two hundred eleven thousand, five hundred thirteen".