21403334121 has 32 divisors (see below), whose sum is σ = 30940277760. Its totient is φ = 13082624064.

The previous prime is 21403334081. The next prime is 21403334137. The reversal of 21403334121 is 12143330412.

It is a happy number.

It is not a de Polignac number, because 21403334121 - 2¹¹ = 21403332073 is a prime.

It is a super-2 number, since 2×21403334121² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21403334091 and 21403334100.

It is not an unprimeable number, because it can be changed into a prime (21403334221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10770690 + ... + 10772676.

It is an arithmetic number, because the mean of its divisors is an integer number (966883680).

Almost surely, 2^21403334121 is an apocalyptic number.

It is an amenable number.

21403334121 is a deficient number, since it is larger than the sum of its proper divisors (9536943639).

21403334121 is a wasteful number, since it uses less digits than its factorization.

21403334121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3725.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21403334121 its reverse (12143330412), we get a palindrome (33546664533).

The spelling of 21403334121 in words is "twenty-one billion, four hundred three million, three hundred thirty-four thousand, one hundred twenty-one".