21201434 has 4 divisors (see below), whose sum is σ = 31802154. Its totient is φ = 10600716.

The previous prime is 21201421. The next prime is 21201443. The reversal of 21201434 is 43410212.

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., 20566225 + 635209 = 4535^2 + 797^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5300357 + ... + 5300360.

Almost surely, 2^21201434 is an apocalyptic number.

21201434 is a deficient number, since it is larger than the sum of its proper divisors (10600720).

21201434 is a wasteful number, since it uses less digits than its factorization.

21201434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10600719.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 21201434 is about 4604.5014931043. The cubic root of 21201434 is about 276.7717408669.

Adding to 21201434 its reverse (43410212), we get a palindrome (64611646).

The spelling of 21201434 in words is "twenty-one million, two hundred one thousand, four hundred thirty-four".