21111012210202 has 8 divisors (see below), whose sum is σ = 31760484246036. Its totient is φ = 10524184128192.

The previous prime is 21111012210137. The next prime is 21111012210209. The reversal of 21111012210202 is 20201221011112.

It can be written as a sum of positive squares in 2 ways, for example, as 20018546175681 + 1092466034521 = 4474209^2 + 1045211^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21111012210209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15660987613 + ... + 15660988960.

Almost surely, 2^{21111012210202} is an apocalyptic number.

21111012210202 is a deficient number, since it is larger than the sum of its proper divisors (10649472035834).

21111012210202 is a wasteful number, since it uses less digits than its factorization.

21111012210202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31321976912.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21111012210202 its reverse (20201221011112), we get a palindrome (41312233221314).

The spelling of 21111012210202 in words is "twenty-one trillion, one hundred eleven billion, twelve million, two hundred ten thousand, two hundred two".