21424214515 has 8 divisors (see below), whose sum is σ = 28046244528. Its totient is φ = 15581246880.

The previous prime is 21424214509. The next prime is 21424214557. The reversal of 21424214515 is 51541242412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21424214515 - 2³ = 21424214507 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194765532 + ... + 194765641.

It is an arithmetic number, because the mean of its divisors is an integer number (3505780566).

Almost surely, 2^21424214515 is an apocalyptic number.

21424214515 is a deficient number, since it is larger than the sum of its proper divisors (6622030013).

21424214515 is a wasteful number, since it uses less digits than its factorization.

21424214515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389531189.

The product of its digits is 12800, while the sum is 31.

Adding to 21424214515 its reverse (51541242412), we get a palindrome (72965456927).

The spelling of 21424214515 in words is "twenty-one billion, four hundred twenty-four million, two hundred fourteen thousand, five hundred fifteen".