21135330154 has 8 divisors (see below), whose sum is σ = 33081386400. Its totient is φ = 10108201356.

The previous prime is 21135330127. The next prime is 21135330169. The reversal of 21135330154 is 45103353112.

It is a happy number.

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

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 229731804 + ... + 229731895.

It is an arithmetic number, because the mean of its divisors is an integer number (4135173300).

Almost surely, 2^21135330154 is an apocalyptic number.

21135330154 is a deficient number, since it is larger than the sum of its proper divisors (11946056246).

21135330154 is a wasteful number, since it uses less digits than its factorization.

21135330154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459463724.

The product of its (nonzero) digits is 5400, while the sum is 28.

Adding to 21135330154 its reverse (45103353112), we get a palindrome (66238683266).

The spelling of 21135330154 in words is "twenty-one billion, one hundred thirty-five million, three hundred thirty thousand, one hundred fifty-four".