21419746 has 4 divisors (see below), whose sum is σ = 32129622. Its totient is φ = 10709872.

The previous prime is 21419737. The next prime is 21419747. The reversal of 21419746 is 64791412.

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., 14861025 + 6558721 = 3855^2 + 2561^2 .

It is not an unprimeable number, because it can be changed into a prime (21419747) by changing a digit.

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 as a sum of consecutive naturals, namely, 5354935 + ... + 5354938.

Almost surely, 2^21419746 is an apocalyptic number.

21419746 is a deficient number, since it is larger than the sum of its proper divisors (10709876).

21419746 is a wasteful number, since it uses less digits than its factorization.

21419746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10709875.

The product of its digits is 12096, while the sum is 34.

The square root of 21419746 is about 4628.1471454568. The cubic root of 21419746 is about 277.7184752456.

The spelling of 21419746 in words is "twenty-one million, four hundred nineteen thousand, seven hundred forty-six".