21021534022315 has 4 divisors (see below), whose sum is σ = 25225840826784. Its totient is φ = 16817227217848.

The previous prime is 21021534022267. The next prime is 21021534022337. The reversal of 21021534022315 is 51322043512012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21021534022315 - 2¹³ = 21021534014123 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2102153402227 + ... + 2102153402236.

It is an arithmetic number, because the mean of its divisors is an integer number (6306460206696).

Almost surely, 2^{21021534022315} is an apocalyptic number.

21021534022315 is a deficient number, since it is larger than the sum of its proper divisors (4204306804469).

21021534022315 is an equidigital number, since it uses as much as digits as its factorization.

21021534022315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4204306804468.

The product of its (nonzero) digits is 14400, while the sum is 31.

Adding to 21021534022315 its reverse (51322043512012), we get a palindrome (72343577534327).

The spelling of 21021534022315 in words is "twenty-one trillion, twenty-one billion, five hundred thirty-four million, twenty-two thousand, three hundred fifteen".