21073774 has 8 divisors (see below), whose sum is σ = 33274440. Its totient is φ = 9982296.

The previous prime is 21073739. The next prime is 21073799. The reversal of 21073774 is 47737012.

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

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 277249 + ... + 277324.

It is an arithmetic number, because the mean of its divisors is an integer number (4159305).

Almost surely, 2^21073774 is an apocalyptic number.

21073774 is a deficient number, since it is larger than the sum of its proper divisors (12200666).

21073774 is a wasteful number, since it uses less digits than its factorization.

21073774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554594.

The product of its (nonzero) digits is 8232, while the sum is 31.

The square root of 21073774 is about 4590.6180411792. The cubic root of 21073774 is about 276.2151144498.

It can be divided in two parts, 210 and 73774, that added together give a square (73984 = 272²).

The spelling of 21073774 in words is "twenty-one million, seventy-three thousand, seven hundred seventy-four".