21383734 has 4 divisors (see below), whose sum is σ = 32075604. Its totient is φ = 10691866.

The previous prime is 21383723. The next prime is 21383749. The reversal of 21383734 is 43738312.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21383696 and 21383705.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5345932 + ... + 5345935.

It is an arithmetic number, because the mean of its divisors is an integer number (8018901).

Almost surely, 2^21383734 is an apocalyptic number.

21383734 is a deficient number, since it is larger than the sum of its proper divisors (10691870).

21383734 is a wasteful number, since it uses less digits than its factorization.

21383734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10691869.

The product of its digits is 12096, while the sum is 31.

The square root of 21383734 is about 4624.2549670190. The cubic root of 21383734 is about 277.5627496546.

The spelling of 21383734 in words is "twenty-one million, three hundred eighty-three thousand, seven hundred thirty-four".