21201220111202 has 4 divisors (see below), whose sum is σ = 31801830166806. Its totient is φ = 10600610055600.

The previous prime is 21201220111171. The next prime is 21201220111213. The reversal of 21201220111202 is 20211102210212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15013369834681 + 6187850276521 = 3874709^2 + 2487539^2 .

It is a super-2 number, since 2×21201220111202² (a number of 27 digits) contains 22 as substring.

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 as a sum of consecutive naturals, namely, 5300305027799 + ... + 5300305027802.

Almost surely, 2^{21201220111202} is an apocalyptic number.

21201220111202 is a deficient number, since it is larger than the sum of its proper divisors (10600610055604).

21201220111202 is a wasteful number, since it uses less digits than its factorization.

21201220111202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10600610055603.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21201220111202 its reverse (20211102210212), we get a palindrome (41412322321414).

The spelling of 21201220111202 in words is "twenty-one trillion, two hundred one billion, two hundred twenty million, one hundred eleven thousand, two hundred two".