21001221200202 has 32 divisors (see below), whose sum is σ = 43290860961600. Its totient is φ = 6787765630080.

The previous prime is 21001221200189. The next prime is 21001221200317. The reversal of 21001221200202 is 20200212210012.

It is a super-3 number, since 3×21001221200202³ (a number of 41 digits) contains 333 as substring.

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, 261833577 + ... + 261913772.

It is an arithmetic number, because the mean of its divisors is an integer number (1352839405050).

Almost surely, 2^{21001221200202} is an apocalyptic number.

21001221200202 is an abundant number, since it is smaller than the sum of its proper divisors (22289639761398).

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

21001221200202 is a wasteful number, since it uses less digits than its factorization.

21001221200202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523747558.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21001221200202 its reverse (20200212210012), we get a palindrome (41201433410214).

The spelling of 21001221200202 in words is "twenty-one trillion, one billion, two hundred twenty-one million, two hundred thousand, two hundred two".