21011403783551 has 8 divisors (see below), whose sum is σ = 23078887451520. Its totient is φ = 19040082146712.

The previous prime is 21011403783493. The next prime is 21011403783577. The reversal of 21011403783551 is 15538730411012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21011403783551 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21011403783499 and 21011403783508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011400783551) 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, 24040507325 + ... + 24040508198.

It is an arithmetic number, because the mean of its divisors is an integer number (2884860931440).

Almost surely, 2^{21011403783551} is an apocalyptic number.

21011403783551 is a deficient number, since it is larger than the sum of its proper divisors (2067483667969).

21011403783551 is a wasteful number, since it uses less digits than its factorization.

21011403783551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48081015565.

The product of its (nonzero) digits is 100800, while the sum is 41.

The spelling of 21011403783551 in words is "twenty-one trillion, eleven billion, four hundred three million, seven hundred eighty-three thousand, five hundred fifty-one".