21512325301323 has 16 divisors (see below), whose sum is σ = 28782694362240. Its totient is φ = 14291796064896.

The previous prime is 21512325301319. The next prime is 21512325301333. The reversal of 21512325301323 is 32310352321512.

It is not a de Polignac number, because 21512325301323 - 2² = 21512325301319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21512325301333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3345513 + ... + 7363226.

It is an arithmetic number, because the mean of its divisors is an integer number (1798918397640).

Almost surely, 2^{21512325301323} is an apocalyptic number.

21512325301323 is a deficient number, since it is larger than the sum of its proper divisors (7270369060917).

21512325301323 is a wasteful number, since it uses less digits than its factorization.

21512325301323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10711066.

The product of its (nonzero) digits is 32400, while the sum is 33.

Adding to 21512325301323 its reverse (32310352321512), we get a palindrome (53822677622835).

The spelling of 21512325301323 in words is "twenty-one trillion, five hundred twelve billion, three hundred twenty-five million, three hundred one thousand, three hundred twenty-three".