21401434 has 4 divisors (see below), whose sum is σ = 32102154. Its totient is φ = 10700716.

The previous prime is 21401417. The next prime is 21401437. The reversal of 21401434 is 43410412.

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., 19775809 + 1625625 = 4447^2 + 1275^2 .

It is not an unprimeable number, because it can be changed into a prime (21401437) 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, 5350357 + ... + 5350360.

Almost surely, 2^21401434 is an apocalyptic number.

21401434 is a deficient number, since it is larger than the sum of its proper divisors (10700720).

21401434 is a wasteful number, since it uses less digits than its factorization.

21401434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10700719.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 21401434 is about 4626.1683929576. The cubic root of 21401434 is about 277.6393110537.

Adding to 21401434 its reverse (43410412), we get a palindrome (64811846).

The spelling of 21401434 in words is "twenty-one million, four hundred one thousand, four hundred thirty-four".