21747002 has 4 divisors (see below), whose sum is σ = 32620506. Its totient is φ = 10873500.

The previous prime is 21746999. The next prime is 21747007. The reversal of 21747002 is 20074712.

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., 18757561 + 2989441 = 4331^2 + 1729^2 .

It is not an unprimeable number, because it can be changed into a prime (21747007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5436749 + ... + 5436752.

Almost surely, 2^21747002 is an apocalyptic number.

21747002 is a deficient number, since it is larger than the sum of its proper divisors (10873504).

21747002 is a wasteful number, since it uses less digits than its factorization.

21747002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10873503.

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 21747002 is about 4663.3680961297. The cubic root of 21747002 is about 279.1256825951.

The spelling of 21747002 in words is "twenty-one million, seven hundred forty-seven thousand, two".