21415432534 has 8 divisors (see below), whose sum is σ = 32125662000. Its totient is φ = 10706878536.

The previous prime is 21415432529. The next prime is 21415432601. The reversal of 21415432534 is 43523451412.

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

It is a super-2 number, since 2×21415432534² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21415432534.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 386409 + ... + 438340.

It is an arithmetic number, because the mean of its divisors is an integer number (4015707750).

Almost surely, 2^21415432534 is an apocalyptic number.

21415432534 is a deficient number, since it is larger than the sum of its proper divisors (10710229466).

21415432534 is a wasteful number, since it uses less digits than its factorization.

21415432534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837734.

The product of its digits is 57600, while the sum is 34.

Adding to 21415432534 its reverse (43523451412), we get a palindrome (64938883946).

The spelling of 21415432534 in words is "twenty-one billion, four hundred fifteen million, four hundred thirty-two thousand, five hundred thirty-four".