21232420121 has 8 divisors (see below), whose sum is σ = 23542356288. Its totient is φ = 18985770000.

The previous prime is 21232420117. The next prime is 21232420127. The reversal of 21232420121 is 12102423212.

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 21232420121 - 2² = 21232420117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21232420093 and 21232420102.

It is not an unprimeable number, because it can be changed into a prime (21232420127) 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, 15820805 + ... + 15822146.

It is an arithmetic number, because the mean of its divisors is an integer number (2942794536).

Almost surely, 2^21232420121 is an apocalyptic number.

It is an amenable number.

21232420121 is a deficient number, since it is larger than the sum of its proper divisors (2309936167).

21232420121 is a wasteful number, since it uses less digits than its factorization.

21232420121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31643023.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21232420121 its reverse (12102423212), we get a palindrome (33334843333).

The spelling of 21232420121 in words is "twenty-one billion, two hundred thirty-two million, four hundred twenty thousand, one hundred twenty-one".