21033354154 has 4 divisors (see below), whose sum is σ = 31550031234. Its totient is φ = 10516677076.

The previous prime is 21033354127. The next prime is 21033354161. The reversal of 21033354154 is 45145333012.

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., 20202358225 + 830995929 = 142135^2 + 28827^2 .

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 as a sum of consecutive naturals, namely, 5258338537 + ... + 5258338540.

Almost surely, 2^21033354154 is an apocalyptic number.

21033354154 is a deficient number, since it is larger than the sum of its proper divisors (10516677080).

21033354154 is a wasteful number, since it uses less digits than its factorization.

21033354154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10516677079.

The product of its (nonzero) digits is 21600, while the sum is 31.

Adding to 21033354154 its reverse (45145333012), we get a palindrome (66178687166).

The spelling of 21033354154 in words is "twenty-one billion, thirty-three million, three hundred fifty-four thousand, one hundred fifty-four".