21040413615 has 48 divisors (see below), whose sum is σ = 39367036800. Its totient is φ = 10334200320.

The previous prime is 21040413601. The next prime is 21040413623. The reversal of 21040413615 is 51631404012.

It is a happy number.

21040413615 is a `hidden beast` number, since 2 + 1 + 0 + 4 + 0 + 41 + 3 + 615 = 666.

It is not a de Polignac number, because 21040413615 - 2⁶ = 21040413551 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 210411 + ... + 293859.

It is an arithmetic number, because the mean of its divisors is an integer number (820146600).

Almost surely, 2^21040413615 is an apocalyptic number.

21040413615 is a deficient number, since it is larger than the sum of its proper divisors (18326623185).

21040413615 is a wasteful number, since it uses less digits than its factorization.

21040413615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83904 (or 83901 counting only the distinct ones).

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

Adding to 21040413615 its reverse (51631404012), we get a palindrome (72671817627).

The spelling of 21040413615 in words is "twenty-one billion, forty million, four hundred thirteen thousand, six hundred fifteen".