21051552434 has 8 divisors (see below), whose sum is σ = 34447994928. Its totient is φ = 9568887460.

The previous prime is 21051552419. The next prime is 21051552439. The reversal of 21051552434 is 43425515012.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21051552434.

It is not an unprimeable number, because it can be changed into a prime (21051552439) by changing a digit.

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, 478444352 + ... + 478444395.

It is an arithmetic number, because the mean of its divisors is an integer number (4305999366).

Almost surely, 2^21051552434 is an apocalyptic number.

21051552434 is a deficient number, since it is larger than the sum of its proper divisors (13396442494).

21051552434 is a wasteful number, since it uses less digits than its factorization.

21051552434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 956888760.

The product of its (nonzero) digits is 24000, while the sum is 32.

The spelling of 21051552434 in words is "twenty-one billion, fifty-one million, five hundred fifty-two thousand, four hundred thirty-four".