21220332121 has 8 divisors (see below), whose sum is σ = 21558965120. Its totient is φ = 20883449808.

The previous prime is 21220332103. The next prime is 21220332137. The reversal of 21220332121 is 12123302212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21220332121 - 2¹¹ = 21220330073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21220332101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 413226 + ... + 461731.

It is an arithmetic number, because the mean of its divisors is an integer number (2694870640).

Almost surely, 2^21220332121 is an apocalyptic number.

It is an amenable number.

21220332121 is a deficient number, since it is larger than the sum of its proper divisors (338632999).

21220332121 is an equidigital number, since it uses as much as digits as its factorization.

21220332121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875343.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21220332121 its reverse (12123302212), we get a palindrome (33343634333).

The spelling of 21220332121 in words is "twenty-one billion, two hundred twenty million, three hundred thirty-two thousand, one hundred twenty-one".