21137002 has 4 divisors (see below), whose sum is σ = 31705506. Its totient is φ = 10568500.

The previous prime is 21136963. The next prime is 21137021. The reversal of 21137002 is 20073112.

It is a happy number.

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., 18071001 + 3066001 = 4251^2 + 1751^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5284249 + ... + 5284252.

Almost surely, 2^21137002 is an apocalyptic number.

21137002 is a deficient number, since it is larger than the sum of its proper divisors (10568504).

21137002 is a wasteful number, since it uses less digits than its factorization.

21137002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10568503.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 21137002 is about 4597.4995377923. The cubic root of 21137002 is about 276.4910829267.

The spelling of 21137002 in words is "twenty-one million, one hundred thirty-seven thousand, two".