21005400315 has 16 divisors (see below), whose sum is σ = 35377516800. Its totient is φ = 10613254752.

The previous prime is 21005400313. The next prime is 21005400347. The reversal of 21005400315 is 51300450012.

It is not a de Polignac number, because 21005400315 - 2¹ = 21005400313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21005400291 and 21005400300.

It is not an unprimeable number, because it can be changed into a prime (21005400313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36851295 + ... + 36851864.

It is an arithmetic number, because the mean of its divisors is an integer number (2211094800).

Almost surely, 2^21005400315 is an apocalyptic number.

21005400315 is a deficient number, since it is larger than the sum of its proper divisors (14372116485).

21005400315 is a wasteful number, since it uses less digits than its factorization.

21005400315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73703186.

The product of its (nonzero) digits is 600, while the sum is 21.

Adding to 21005400315 its reverse (51300450012), we get a palindrome (72305850327).

The spelling of 21005400315 in words is "twenty-one billion, five million, four hundred thousand, three hundred fifteen".