21121310352361 has 8 divisors (see below), whose sum is σ = 22041113400000. Its totient is φ = 20201631071952.

The previous prime is 21121310352323. The next prime is 21121310352391. The reversal of 21121310352361 is 16325301312112.

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 21121310352361 - 2²⁹ = 21120773481449 is a prime.

It is a super-2 number, since 2×21121310352361² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121310352391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30592986 + ... + 31275763.

It is an arithmetic number, because the mean of its divisors is an integer number (2755139175000).

Almost surely, 2^{21121310352361} is an apocalyptic number.

It is an amenable number.

21121310352361 is a deficient number, since it is larger than the sum of its proper divisors (919803047639).

21121310352361 is a wasteful number, since it uses less digits than its factorization.

21121310352361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61883615.

The product of its (nonzero) digits is 6480, while the sum is 31.

Adding to 21121310352361 its reverse (16325301312112), we get a palindrome (37446611664473).

The spelling of 21121310352361 in words is "twenty-one trillion, one hundred twenty-one billion, three hundred ten million, three hundred fifty-two thousand, three hundred sixty-one".