21367028506 has 8 divisors (see below), whose sum is σ = 32059528704. Its totient is φ = 10680518940.

The previous prime is 21367028503. The next prime is 21367028519. The reversal of 21367028506 is 60582076312.

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

It is not an unprimeable number, because it can be changed into a prime (21367028503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1488730 + ... + 1503013.

It is an arithmetic number, because the mean of its divisors is an integer number (4007441088).

Almost surely, 2^21367028506 is an apocalyptic number.

21367028506 is a deficient number, since it is larger than the sum of its proper divisors (10692500198).

21367028506 is a wasteful number, since it uses less digits than its factorization.

21367028506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2995316.

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 21367028506 in words is "twenty-one billion, three hundred sixty-seven million, twenty-eight thousand, five hundred six".