21004450202 has 16 divisors (see below), whose sum is σ = 31914016200. Its totient is φ = 10367161920.

The previous prime is 21004450177. The next prime is 21004450273. The reversal of 21004450202 is 20205440012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17148164401 + 3856285801 = 130951^2 + 62099^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120449 + ... + 237732.

Almost surely, 2^21004450202 is an apocalyptic number.

21004450202 is a deficient number, since it is larger than the sum of its proper divisors (10909565998).

21004450202 is a wasteful number, since it uses less digits than its factorization.

21004450202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358561.

The product of its (nonzero) digits is 640, while the sum is 20.

Adding to 21004450202 its reverse (20205440012), we get a palindrome (41209890214).

The spelling of 21004450202 in words is "twenty-one billion, four million, four hundred fifty thousand, two hundred two".