21211110121202 has 4 divisors (see below), whose sum is σ = 31816665181806. Its totient is φ = 10605555060600.

The previous prime is 21211110121193. The next prime is 21211110121217. The reversal of 21211110121202 is 20212101111212.

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., 16585345845121 + 4625764276081 = 4072511^2 + 2150759^2 .

It is a super-2 number, since 2×21211110121202² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5302777530299 + ... + 5302777530302.

Almost surely, 2^{21211110121202} is an apocalyptic number.

21211110121202 is a deficient number, since it is larger than the sum of its proper divisors (10605555060604).

21211110121202 is a wasteful number, since it uses less digits than its factorization.

21211110121202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10605555060603.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21211110121202 its reverse (20212101111212), we get a palindrome (41423211232414).

The spelling of 21211110121202 in words is "twenty-one trillion, two hundred eleven billion, one hundred ten million, one hundred twenty-one thousand, two hundred two".