21020100202 has 8 divisors (see below), whose sum is σ = 31741762500. Its totient is φ = 10439512704.

The previous prime is 21020100163. The next prime is 21020100239. The reversal of 21020100202 is 20200102012.

It can be written as a sum of positive squares in 2 ways, for example, as 20964433681 + 55666521 = 144791^2 + 7461^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21020100202² (a number of 21 digits) contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 35268327 + ... + 35268922.

Almost surely, 2^21020100202 is an apocalyptic number.

21020100202 is a deficient number, since it is larger than the sum of its proper divisors (10721662298).

21020100202 is a wasteful number, since it uses less digits than its factorization.

21020100202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70537400.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 21020100202 its reverse (20200102012), we get a palindrome (41220202214).

The spelling of 21020100202 in words is "twenty-one billion, twenty million, one hundred thousand, two hundred two".