21002365106 has 8 divisors (see below), whose sum is σ = 31524401664. Its totient is φ = 10494231220.

The previous prime is 21002365081. The next prime is 21002365129. The reversal of 21002365106 is 60156320012.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3471890 + ... + 3477933.

It is an arithmetic number, because the mean of its divisors is an integer number (3940550208).

Almost surely, 2^21002365106 is an apocalyptic number.

21002365106 is a deficient number, since it is larger than the sum of its proper divisors (10522036558).

21002365106 is a wasteful number, since it uses less digits than its factorization.

21002365106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6951336.

The product of its (nonzero) digits is 2160, while the sum is 26.

Adding to 21002365106 its reverse (60156320012), we get a palindrome (81158685118).

The spelling of 21002365106 in words is "twenty-one billion, two million, three hundred sixty-five thousand, one hundred six".