21434400515 has 32 divisors (see below), whose sum is σ = 28921577472. Its totient is φ = 15116976000.

The previous prime is 21434400469. The next prime is 21434400523. The reversal of 21434400515 is 51500443412.

It is not a de Polignac number, because 21434400515 - 2⁸ = 21434400259 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 193214 + ... + 283196.

It is an arithmetic number, because the mean of its divisors is an integer number (903799296).

Almost surely, 2^21434400515 is an apocalyptic number.

21434400515 is a deficient number, since it is larger than the sum of its proper divisors (7487176957).

21434400515 is a wasteful number, since it uses less digits than its factorization.

21434400515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90131.

The product of its (nonzero) digits is 9600, while the sum is 29.

Adding to 21434400515 its reverse (51500443412), we get a palindrome (72934843927).

The spelling of 21434400515 in words is "twenty-one billion, four hundred thirty-four million, four hundred thousand, five hundred fifteen".