21032220121 has 12 divisors (see below), whose sum is σ = 23140882800. Its totient is φ = 19101324440.

The previous prime is 21032220061. The next prime is 21032220137. The reversal of 21032220121 is 12102223012.

It is a happy number.

It is not a de Polignac number, because 21032220121 - 2¹⁹ = 21031695833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21032220095 and 21032220104.

It is not an unprimeable number, because it can be changed into a prime (21032220151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38010 + ... + 208588.

It is an arithmetic number, because the mean of its divisors is an integer number (1928406900).

Almost surely, 2^21032220121 is an apocalyptic number.

It is an amenable number.

21032220121 is a deficient number, since it is larger than the sum of its proper divisors (2108662679).

21032220121 is a wasteful number, since it uses less digits than its factorization.

21032220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171620 (or 171609 counting only the distinct ones).

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

Adding to 21032220121 its reverse (12102223012), we get a palindrome (33134443133).

The spelling of 21032220121 in words is "twenty-one billion, thirty-two million, two hundred twenty thousand, one hundred twenty-one".