21551413774 has 96 divisors (see below), whose sum is σ = 38386690560. Its totient is φ = 8995584000.

The previous prime is 21551413729. The next prime is 21551413777. The reversal of 21551413774 is 47731415512.

21551413774 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

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 47 ways as a sum of consecutive naturals, for example, 53743974 + ... + 53744374.

It is an arithmetic number, because the mean of its divisors is an integer number (399861360).

Almost surely, 2^21551413774 is an apocalyptic number.

21551413774 is a deficient number, since it is larger than the sum of its proper divisors (16835276786).

21551413774 is a wasteful number, since it uses less digits than its factorization.

21551413774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634 (or 617 counting only the distinct ones).

The product of its digits is 117600, while the sum is 40.

The spelling of 21551413774 in words is "twenty-one billion, five hundred fifty-one million, four hundred thirteen thousand, seven hundred seventy-four".