21434503016 has 8 divisors (see below), whose sum is σ = 40189693170. Its totient is φ = 10717251504.

The previous prime is 21434502941. The next prime is 21434503019. The reversal of 21434503016 is 61030543412.

It can be written as a sum of positive squares in only one way, i.e., 12305464900 + 9129038116 = 110930^2 + 95546^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 21434503016.

It is not an unprimeable number, because it can be changed into a prime (21434503019) by changing a digit.

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 as a sum of consecutive naturals, namely, 1339656431 + ... + 1339656446.

Almost surely, 2^21434503016 is an apocalyptic number.

It is an amenable number.

21434503016 is a deficient number, since it is larger than the sum of its proper divisors (18755190154).

21434503016 is a wasteful number, since it uses less digits than its factorization.

21434503016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2679312883 (or 2679312879 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The spelling of 21434503016 in words is "twenty-one billion, four hundred thirty-four million, five hundred three thousand, sixteen".