20652213521 has 16 divisors (see below), whose sum is σ = 22148598528. Its totient is φ = 19206475200.

The previous prime is 20652213493. The next prime is 20652213539. The reversal of 20652213521 is 12531225602.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20652213521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20652213221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1277831 + ... + 1293891.

It is an arithmetic number, because the mean of its divisors is an integer number (1384287408).

Almost surely, 2^20652213521 is an apocalyptic number.

It is an amenable number.

20652213521 is a deficient number, since it is larger than the sum of its proper divisors (1496385007).

20652213521 is a wasteful number, since it uses less digits than its factorization.

20652213521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17632.

The product of its (nonzero) digits is 7200, while the sum is 29.

The spelling of 20652213521 in words is "twenty billion, six hundred fifty-two million, two hundred thirteen thousand, five hundred twenty-one".