21334100121 has 24 divisors (see below), whose sum is σ = 30972381440. Its totient is φ = 14150707776.

The previous prime is 21334100113. The next prime is 21334100141. The reversal of 21334100121 is 12100143312.

21334100121 is a `hidden beast` number, since 2 + 133 + 410 + 0 + 121 = 666.

It is not a de Polignac number, because 21334100121 - 2³ = 21334100113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21334100094 and 21334100103.

It is not an unprimeable number, because it can be changed into a prime (21334100111) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1442661 + ... + 1457373.

Almost surely, 2^21334100121 is an apocalyptic number.

It is an amenable number.

21334100121 is a deficient number, since it is larger than the sum of its proper divisors (9638281319).

21334100121 is a wasteful number, since it uses less digits than its factorization.

21334100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15525 (or 15522 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21334100121 its reverse (12100143312), we get a palindrome (33434243433).

The spelling of 21334100121 in words is "twenty-one billion, three hundred thirty-four million, one hundred thousand, one hundred twenty-one".