21387606830 has 16 divisors (see below), whose sum is σ = 38961521424. Its totient is φ = 8451969600.

The previous prime is 21387606791. The next prime is 21387606833. The reversal of 21387606830 is 3860678312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21387606833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12883271 + ... + 12884930.

It is an arithmetic number, because the mean of its divisors is an integer number (2435095089).

Almost surely, 2^21387606830 is an apocalyptic number.

21387606830 is a deficient number, since it is larger than the sum of its proper divisors (17573914594).

21387606830 is a wasteful number, since it uses less digits than its factorization.

21387606830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25768291.

The product of its (nonzero) digits is 290304, while the sum is 44.

The spelling of 21387606830 in words is "twenty-one billion, three hundred eighty-seven million, six hundred six thousand, eight hundred thirty".