21312000121 has 8 divisors (see below), whose sum is σ = 21965749344. Its totient is φ = 20664629280.

The previous prime is 21312000113. The next prime is 21312000181. The reversal of 21312000121 is 12100021312.

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 21312000121 - 2³ = 21312000113 is a prime.

It is a super-3 number, since 3×21312000121³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21312000181) 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, 1587811 + ... + 1601176.

It is an arithmetic number, because the mean of its divisors is an integer number (2745718668).

Almost surely, 2^21312000121 is an apocalyptic number.

It is an amenable number.

21312000121 is a deficient number, since it is larger than the sum of its proper divisors (653749223).

21312000121 is a wasteful number, since it uses less digits than its factorization.

21312000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3189191.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21312000121 its reverse (12100021312), we get a palindrome (33412021433).

The spelling of 21312000121 in words is "twenty-one billion, three hundred twelve million, one hundred twenty-one", and thus it is an aban number.