21011020200202 has 16 divisors (see below), whose sum is σ = 33398509825800. Its totient is φ = 9895854760960.

The previous prime is 21011020200199. The next prime is 21011020200271. The reversal of 21011020200202 is 20200202011012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 14493165246121 + 6517854954081 = 3806989^2 + 2553009^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4417789927 + ... + 4417794682.

Almost surely, 2^{21011020200202} is an apocalyptic number.

21011020200202 is a deficient number, since it is larger than the sum of its proper divisors (12387489625598).

21011020200202 is a wasteful number, since it uses less digits than its factorization.

21011020200202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8835584681.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21011020200202 its reverse (20200202011012), we get a palindrome (41211222211214).

The spelling of 21011020200202 in words is "twenty-one trillion, eleven billion, twenty million, two hundred thousand, two hundred two".