21533615434 has 8 divisors (see below), whose sum is σ = 32442716448. Its totient is φ = 10719376620.

The previous prime is 21533615419. The next prime is 21533615449. The reversal of 21533615434 is 43451633512.

It is an interprime number because it is at equal distance from previous prime (21533615419) and next prime (21533615449).

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 = 21533615393 and 21533615402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23714982 + ... + 23715889.

It is an arithmetic number, because the mean of its divisors is an integer number (4055339556).

Almost surely, 2^21533615434 is an apocalyptic number.

21533615434 is a deficient number, since it is larger than the sum of its proper divisors (10909101014).

21533615434 is a wasteful number, since it uses less digits than its factorization.

21533615434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47431100.

The product of its digits is 129600, while the sum is 37.

The spelling of 21533615434 in words is "twenty-one billion, five hundred thirty-three million, six hundred fifteen thousand, four hundred thirty-four".