21019019202 has 48 divisors (see below), whose sum is σ = 45671853240. Its totient is φ = 6986278656.

The previous prime is 21019019167. The next prime is 21019019209. The reversal of 21019019202 is 20291091012.

It can be written as a sum of positive squares in 4 ways, for example, as 20799119961 + 219899241 = 144219^2 + 14829^2 .

It is not an unprimeable number, because it can be changed into a prime (21019019209) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 17101924 + ... + 17103152.

Almost surely, 2^21019019202 is an apocalyptic number.

21019019202 is an abundant number, since it is smaller than the sum of its proper divisors (24652834038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21019019202 is a wasteful number, since it uses less digits than its factorization.

21019019202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3187 (or 3184 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The spelling of 21019019202 in words is "twenty-one billion, nineteen million, nineteen thousand, two hundred two".