21221011221202 has 32 divisors (see below), whose sum is σ = 34310243520000. Its totient is φ = 9785700288000.

The previous prime is 21221011221161. The next prime is 21221011221217. The reversal of 21221011221202 is 20212211012212.

It is a self number, because there is not a number n which added to its sum of digits gives 21221011221202.

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, 738801613 + ... + 738830335.

It is an arithmetic number, because the mean of its divisors is an integer number (1072195110000).

Almost surely, 2^{21221011221202} is an apocalyptic number.

21221011221202 is a deficient number, since it is larger than the sum of its proper divisors (13089232298798).

21221011221202 is a wasteful number, since it uses less digits than its factorization.

21221011221202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52738.

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

Adding to 21221011221202 its reverse (20212211012212), we get a palindrome (41433222233414).

The spelling of 21221011221202 in words is "twenty-one trillion, two hundred twenty-one billion, eleven million, two hundred twenty-one thousand, two hundred two".