21002134533315 has 32 divisors (see below), whose sum is σ = 36188516534016. Its totient is φ = 10339448618880.

The previous prime is 21002134533313. The next prime is 21002134533337. The reversal of 21002134533315 is 51333543120012.

It is not a de Polignac number, because 21002134533315 - 2¹ = 21002134533313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21002134533313) 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, 54628992 + ... + 55012098.

It is an arithmetic number, because the mean of its divisors is an integer number (1130891141688).

Almost surely, 2^{21002134533315} is an apocalyptic number.

21002134533315 is a deficient number, since it is larger than the sum of its proper divisors (15186382000701).

21002134533315 is a wasteful number, since it uses less digits than its factorization.

21002134533315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 664259.

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

Adding to 21002134533315 its reverse (51333543120012), we get a palindrome (72335677653327).

The spelling of 21002134533315 in words is "twenty-one trillion, two billion, one hundred thirty-four million, five hundred thirty-three thousand, three hundred fifteen".