21551413773 has 8 divisors (see below), whose sum is σ = 28741595200. Its totient is φ = 14364420768.

The previous prime is 21551413729. The next prime is 21551413777. The reversal of 21551413773 is 37731415512.

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

It is not a de Polignac number, because 21551413773 - 2¹³ = 21551405581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21551413777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 781288 + ... + 808401.

It is an arithmetic number, because the mean of its divisors is an integer number (3592699400).

Almost surely, 2^21551413773 is an apocalyptic number.

It is an amenable number.

21551413773 is a deficient number, since it is larger than the sum of its proper divisors (7190181427).

21551413773 is a wasteful number, since it uses less digits than its factorization.

21551413773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1594211.

The product of its digits is 88200, while the sum is 39.

The spelling of 21551413773 in words is "twenty-one billion, five hundred fifty-one million, four hundred thirteen thousand, seven hundred seventy-three".