21110021221202 has 4 divisors (see below), whose sum is σ = 31665031831806. Its totient is φ = 10555010610600.

The previous prime is 21110021221193. The next prime is 21110021221207. The reversal of 21110021221202 is 20212212001112.

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., 13447483060561 + 7662538160641 = 3667081^2 + 2768129^2 .

It is not an unprimeable number, because it can be changed into a prime (21110021221207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5277505305299 + ... + 5277505305302.

Almost surely, 2^{21110021221202} is an apocalyptic number.

21110021221202 is a deficient number, since it is larger than the sum of its proper divisors (10555010610604).

21110021221202 is a wasteful number, since it uses less digits than its factorization.

21110021221202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10555010610603.

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

Adding to 21110021221202 its reverse (20212212001112), we get a palindrome (41322233222314).

The spelling of 21110021221202 in words is "twenty-one trillion, one hundred ten billion, twenty-one million, two hundred twenty-one thousand, two hundred two".