21422734 has 4 divisors (see below), whose sum is σ = 32134104. Its totient is φ = 10711366.

The previous prime is 21422717. The next prime is 21422743. The reversal of 21422734 is 43722412.

It is a happy number.

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 = 21422699 and 21422708.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5355682 + ... + 5355685.

It is an arithmetic number, because the mean of its divisors is an integer number (8033526).

Almost surely, 2^21422734 is an apocalyptic number.

21422734 is a deficient number, since it is larger than the sum of its proper divisors (10711370).

21422734 is a wasteful number, since it uses less digits than its factorization.

21422734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10711369.

The product of its digits is 2688, while the sum is 25.

The square root of 21422734 is about 4628.4699415682. The cubic root of 21422734 is about 277.7313883185.

The spelling of 21422734 in words is "twenty-one million, four hundred twenty-two thousand, seven hundred thirty-four".