21429754 has 4 divisors (see below), whose sum is σ = 32144634. Its totient is φ = 10714876.

The previous prime is 21429743. The next prime is 21429761. The reversal of 21429754 is 45792412.

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

It can be written as a sum of positive squares in only one way, i.e., 21206025 + 223729 = 4605^2 + 473^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5357437 + ... + 5357440.

Almost surely, 2^21429754 is an apocalyptic number.

21429754 is a deficient number, since it is larger than the sum of its proper divisors (10714880).

21429754 is a wasteful number, since it uses less digits than its factorization.

21429754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10714879.

The product of its digits is 20160, while the sum is 34.

The square root of 21429754 is about 4629.2282294136. The cubic root of 21429754 is about 277.7617215371.

The spelling of 21429754 in words is "twenty-one million, four hundred twenty-nine thousand, seven hundred fifty-four".