21387858034 has 16 divisors (see below), whose sum is σ = 33997524120. Its totient is φ = 10073338240.

The previous prime is 21387858031. The next prime is 21387858043. The reversal of 21387858034 is 43085878312.

It can be written as a sum of positive squares in 4 ways, for example, as 5394461809 + 15993396225 = 73447^2 + 126465^2 .

It is not an unprimeable number, because it can be changed into a prime (21387858031) 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 7 ways as a sum of consecutive naturals, for example, 4494649 + ... + 4499404.

Almost surely, 2^21387858034 is an apocalyptic number.

21387858034 is a deficient number, since it is larger than the sum of its proper divisors (12609666086).

21387858034 is a wasteful number, since it uses less digits than its factorization.

21387858034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8994125.

The product of its (nonzero) digits is 1290240, while the sum is 49.

The spelling of 21387858034 in words is "twenty-one billion, three hundred eighty-seven million, eight hundred fifty-eight thousand, thirty-four".