21001212021202 has 96 divisors (see below), whose sum is σ = 37516495040640. Its totient is φ = 8788742565120.

The previous prime is 21001212021191. The next prime is 21001212021203. The reversal of 21001212021202 is 20212021210012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21001212021203) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 807632733 + ... + 807658735.

It is an arithmetic number, because the mean of its divisors is an integer number (390796823340).

Almost surely, 2^{21001212021202} is an apocalyptic number.

21001212021202 is a deficient number, since it is larger than the sum of its proper divisors (16515283019438).

21001212021202 is a wasteful number, since it uses less digits than its factorization.

21001212021202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27056 (or 27049 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21001212021202 its reverse (20212021210012), we get a palindrome (41213233231214).

The spelling of 21001212021202 in words is "twenty-one trillion, one billion, two hundred twelve million, twenty-one thousand, two hundred two".