21354253534 has 8 divisors (see below), whose sum is σ = 32509460808. Its totient is φ = 10517766600.

The previous prime is 21354253489. The next prime is 21354253549. The reversal of 21354253534 is 43535245312.

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

It is a junction number, because it is equal to n+sod(n) for n = 21354253493 and 21354253502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79679917 + ... + 79680184.

It is an arithmetic number, because the mean of its divisors is an integer number (4063682601).

Almost surely, 2^21354253534 is an apocalyptic number.

21354253534 is a deficient number, since it is larger than the sum of its proper divisors (11155207274).

21354253534 is a wasteful number, since it uses less digits than its factorization.

21354253534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159360170.

The product of its digits is 216000, while the sum is 37.

Adding to 21354253534 its reverse (43535245312), we get a palindrome (64889498846).

The spelling of 21354253534 in words is "twenty-one billion, three hundred fifty-four million, two hundred fifty-three thousand, five hundred thirty-four".