21001101121202 has 4 divisors (see below), whose sum is σ = 31501651681806. Its totient is φ = 10500550560600.

The previous prime is 21001101121201. The next prime is 21001101121223. The reversal of 21001101121202 is 20212110110012.

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., 11631435219121 + 9369665902081 = 3410489^2 + 3060991^2 .

It is not an unprimeable number, because it can be changed into a prime (21001101121201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5250275280299 + ... + 5250275280302.

Almost surely, 2^{21001101121202} is an apocalyptic number.

21001101121202 is a deficient number, since it is larger than the sum of its proper divisors (10500550560604).

21001101121202 is a wasteful number, since it uses less digits than its factorization.

21001101121202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10500550560603.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21001101121202 its reverse (20212110110012), we get a palindrome (41213211231214).

The spelling of 21001101121202 in words is "twenty-one trillion, one billion, one hundred one million, one hundred twenty-one thousand, two hundred two".