21404363454154 has 8 divisors (see below), whose sum is σ = 32493371027040. Its totient is φ = 10573239778476.

The previous prime is 21404363454113. The next prime is 21404363454203. The reversal of 21404363454154 is 45145436340412.

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 (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64470974094 + ... + 64470974425.

It is an arithmetic number, because the mean of its divisors is an integer number (4061671378380).

Almost surely, 2^{21404363454154} is an apocalyptic number.

21404363454154 is a deficient number, since it is larger than the sum of its proper divisors (11089007572886).

21404363454154 is a wasteful number, since it uses less digits than its factorization.

21404363454154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128941948604.

The product of its (nonzero) digits is 2764800, while the sum is 46.

Adding to 21404363454154 its reverse (45145436340412), we get a palindrome (66549799794566).

The spelling of 21404363454154 in words is "twenty-one trillion, four hundred four billion, three hundred sixty-three million, four hundred fifty-four thousand, one hundred fifty-four".