21711202 has 4 divisors (see below), whose sum is σ = 32566806. Its totient is φ = 10855600.

The previous prime is 21711163. The next prime is 21711229. The reversal of 21711202 is 20211712.

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., 19018321 + 2692881 = 4361^2 + 1641^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5427799 + ... + 5427802.

Almost surely, 2^21711202 is an apocalyptic number.

21711202 is a deficient number, since it is larger than the sum of its proper divisors (10855604).

21711202 is a wasteful number, since it uses less digits than its factorization.

21711202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10855603.

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 21711202 is about 4659.5280876930. The cubic root of 21711202 is about 278.9724325395.

Adding to 21711202 its reverse (20211712), we get a palindrome (41922914).

The spelling of 21711202 in words is "twenty-one million, seven hundred eleven thousand, two hundred two".