21016404315 has 16 divisors (see below), whose sum is σ = 37362496800. Its totient is φ = 11208748896.

The previous prime is 21016404289. The next prime is 21016404323. The reversal of 21016404315 is 51340461012.

It is a happy number.

21016404315 is a `hidden beast` number, since 2 + 1 + 0 + 1 + 640 + 4 + 3 + 15 = 666.

It is not a de Polignac number, because 21016404315 - 2¹⁶ = 21016338779 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77838400 + ... + 77838669.

It is an arithmetic number, because the mean of its divisors is an integer number (2335156050).

Almost surely, 2^21016404315 is an apocalyptic number.

21016404315 is a deficient number, since it is larger than the sum of its proper divisors (16346092485).

21016404315 is a wasteful number, since it uses less digits than its factorization.

21016404315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155677083 (or 155677077 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

Adding to 21016404315 its reverse (51340461012), we get a palindrome (72356865327).

The spelling of 21016404315 in words is "twenty-one billion, sixteen million, four hundred four thousand, three hundred fifteen".