21315341355 has 64 divisors (see below), whose sum is σ = 42540208128. Its totient is φ = 8854104960.

The previous prime is 21315341317. The next prime is 21315341357. The reversal of 21315341355 is 55314351312.

It is not a de Polignac number, because 21315341355 - 2¹⁵ = 21315308587 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (21315341357) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4001724 + ... + 4007046.

It is an arithmetic number, because the mean of its divisors is an integer number (664690752).

Almost surely, 2^21315341355 is an apocalyptic number.

21315341355 is a deficient number, since it is larger than the sum of its proper divisors (21224866773).

21315341355 is a wasteful number, since it uses less digits than its factorization.

21315341355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8816.

The product of its digits is 27000, while the sum is 33.

Adding to 21315341355 its reverse (55314351312), we get a palindrome (76629692667).

The spelling of 21315341355 in words is "twenty-one billion, three hundred fifteen million, three hundred forty-one thousand, three hundred fifty-five".