20132221021 has 16 divisors (see below), whose sum is σ = 22720896576. Its totient is φ = 17678800000.

The previous prime is 20132221019. The next prime is 20132221033. The reversal of 20132221021 is 12012223102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20132221021 - 2¹ = 20132221019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20132220986 and 20132221004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20132221061) 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, 175435 + ... + 266536.

It is an arithmetic number, because the mean of its divisors is an integer number (1420056036).

Almost surely, 2^20132221021 is an apocalyptic number.

It is an amenable number.

20132221021 is a deficient number, since it is larger than the sum of its proper divisors (2588675555).

20132221021 is a wasteful number, since it uses less digits than its factorization.

20132221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442124.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20132221021 its reverse (12012223102), we get a palindrome (32144444123).

The spelling of 20132221021 in words is "twenty billion, one hundred thirty-two million, two hundred twenty-one thousand, twenty-one".