21201121102202 has 4 divisors (see below), whose sum is σ = 31801681653306. Its totient is φ = 10600560551100.

The previous prime is 21201121102201. The next prime is 21201121102241. The reversal of 21201121102202 is 20220112110212.

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., 14860338817921 + 6340782284281 = 3854911^2 + 2518091^2 .

It is not an unprimeable number, because it can be changed into a prime (21201121102201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5300280275549 + ... + 5300280275552.

Almost surely, 2^{21201121102202} is an apocalyptic number.

21201121102202 is a deficient number, since it is larger than the sum of its proper divisors (10600560551104).

21201121102202 is a wasteful number, since it uses less digits than its factorization.

21201121102202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10600560551103.

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

Adding to 21201121102202 its reverse (20220112110212), we get a palindrome (41421233212414).

The spelling of 21201121102202 in words is "twenty-one trillion, two hundred one billion, one hundred twenty-one million, one hundred two thousand, two hundred two".