21001001220202 has 32 divisors (see below), whose sum is σ = 34137601039872. Its totient is φ = 9663953113584.

The previous prime is 21001001220193. The next prime is 21001001220229. The reversal of 21001001220202 is 20202210010012.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79100988 + ... + 79366039.

It is an arithmetic number, because the mean of its divisors is an integer number (1066800032496).

Almost surely, 2^{21001001220202} is an apocalyptic number.

21001001220202 is a deficient number, since it is larger than the sum of its proper divisors (13136599819670).

21001001220202 is a wasteful number, since it uses less digits than its factorization.

21001001220202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158467162.

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

Adding to 21001001220202 its reverse (20202210010012), we get a palindrome (41203211230214).

It can be divided in two parts, 210010012 and 20202, that multiplied together give a palindrome (4242622262424).

The spelling of 21001001220202 in words is "twenty-one trillion, one billion, one million, two hundred twenty thousand, two hundred two".