21254734 has 4 divisors (see below), whose sum is σ = 31882104. Its totient is φ = 10627366.

The previous prime is 21254729. The next prime is 21254789. The reversal of 21254734 is 43745212.

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

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, 5313682 + ... + 5313685.

It is an arithmetic number, because the mean of its divisors is an integer number (7970526).

Almost surely, 2^21254734 is an apocalyptic number.

21254734 is a deficient number, since it is larger than the sum of its proper divisors (10627370).

21254734 is a wasteful number, since it uses less digits than its factorization.

21254734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10627369.

The product of its digits is 6720, while the sum is 28.

The square root of 21254734 is about 4610.2856744458. The cubic root of 21254734 is about 277.0034797358.

Adding to 21254734 its reverse (43745212), we get a palindrome (64999946).

It can be divided in two parts, 2125 and 4734, that added together give a cube (6859 = 19³).

The spelling of 21254734 in words is "twenty-one million, two hundred fifty-four thousand, seven hundred thirty-four".