21011221221202 has 16 divisors (see below), whose sum is σ = 31600875347712. Its totient is φ = 10477605140800.

The previous prime is 21011221221173. The next prime is 21011221221317. The reversal of 21011221221202 is 20212212211012.

It is a self number, because there is not a number n which added to its sum of digits gives 21011221221202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2401443 + ... + 6912985.

It is an arithmetic number, because the mean of its divisors is an integer number (1975054709232).

Almost surely, 2^{21011221221202} is an apocalyptic number.

21011221221202 is a deficient number, since it is larger than the sum of its proper divisors (10589654126510).

21011221221202 is a wasteful number, since it uses less digits than its factorization.

21011221221202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4517753.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21011221221202 its reverse (20212212211012), we get a palindrome (41223433432214).

The spelling of 21011221221202 in words is "twenty-one trillion, eleven billion, two hundred twenty-one million, two hundred twenty-one thousand, two hundred two".