21202111212010 has 8 divisors (see below), whose sum is σ = 38163800181636. Its totient is φ = 8480844484800.

The previous prime is 21202111211989. The next prime is 21202111212013. The reversal of 21202111212010 is 1021211120212.

It can be written as a sum of positive squares in 2 ways, for example, as 20680383809761 + 521727402249 = 4547569^2 + 722307^2 .

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 (21202111212013) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 1060105560591 + ... + 1060105560610.

Almost surely, 2^{21202111212010} is an apocalyptic number.

21202111212010 is a deficient number, since it is larger than the sum of its proper divisors (16961688969626).

21202111212010 is a wasteful number, since it uses less digits than its factorization.

21202111212010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2120211121208.

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

Adding to 21202111212010 its reverse (1021211120212), we get a palindrome (22223322332222).

The spelling of 21202111212010 in words is "twenty-one trillion, two hundred two billion, one hundred eleven million, two hundred twelve thousand, ten".