21101403555451 has 8 divisors (see below), whose sum is σ = 22213264207680. Its totient is φ = 19989668949768.

The previous prime is 21101403555443. The next prime is 21101403555473. The reversal of 21101403555451 is 15455530410112.

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

It is a cyclic number.

It is not a de Polignac number, because 21101403555451 - 2³ = 21101403555443 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21101403555451.

It is not an unprimeable number, because it can be changed into a prime (21101403555481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31167901 + ... + 31837726.

It is an arithmetic number, because the mean of its divisors is an integer number (2776658025960).

Almost surely, 2^{21101403555451} is an apocalyptic number.

21101403555451 is a deficient number, since it is larger than the sum of its proper divisors (1111860652229).

21101403555451 is a wasteful number, since it uses less digits than its factorization.

21101403555451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63023273.

The product of its (nonzero) digits is 60000, while the sum is 37.

Adding to 21101403555451 its reverse (15455530410112), we get a palindrome (36556933965563).

The spelling of 21101403555451 in words is "twenty-one trillion, one hundred one billion, four hundred three million, five hundred fifty-five thousand, four hundred fifty-one".