21233215154 has 4 divisors (see below), whose sum is σ = 31849822734. Its totient is φ = 10616607576.

The previous prime is 21233215147. The next prime is 21233215183. The reversal of 21233215154 is 45151233212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12349210129 + 8884005025 = 111127^2 + 94255^2 .

It is a Curzon number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5308303787 + ... + 5308303790.

Almost surely, 2^21233215154 is an apocalyptic number.

21233215154 is a deficient number, since it is larger than the sum of its proper divisors (10616607580).

21233215154 is a wasteful number, since it uses less digits than its factorization.

21233215154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10616607579.

The product of its digits is 7200, while the sum is 29.

Adding to 21233215154 its reverse (45151233212), we get a palindrome (66384448366).

The spelling of 21233215154 in words is "twenty-one billion, two hundred thirty-three million, two hundred fifteen thousand, one hundred fifty-four".