21002020202 has 8 divisors (see below), whose sum is σ = 31570490016. Its totient is φ = 10478523532.

The previous prime is 21002020189. The next prime is 21002020219. The reversal of 21002020202 is 20202020012.

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

It is a super-2 number, since 2×21002020202² (a number of 21 digits) contains 22 as substring.

21002020202 is a modest number, since divided by 2020202 gives 210 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11242118 + ... + 11243985.

It is an arithmetic number, because the mean of its divisors is an integer number (3946311252).

Almost surely, 2^21002020202 is an apocalyptic number.

21002020202 is a deficient number, since it is larger than the sum of its proper divisors (10568469814).

21002020202 is a wasteful number, since it uses less digits than its factorization.

21002020202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22486572.

The product of its (nonzero) digits is 32, while the sum is 11.

Adding to 21002020202 its reverse (20202020012), we get a palindrome (41204040214).

The spelling of 21002020202 in words is "twenty-one billion, two million, twenty thousand, two hundred two".