21001120021202 has 4 divisors (see below), whose sum is σ = 31501680031806. Its totient is φ = 10500560010600.

The previous prime is 21001120021153. The next prime is 21001120021229. The reversal of 21001120021202 is 20212002110012.

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., 12284401117921 + 8716718903281 = 3504911^2 + 2952409^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5250280005299 + ... + 5250280005302.

Almost surely, 2^{21001120021202} is an apocalyptic number.

21001120021202 is a deficient number, since it is larger than the sum of its proper divisors (10500560010604).

21001120021202 is a wasteful number, since it uses less digits than its factorization.

21001120021202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10500560010603.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21001120021202 its reverse (20212002110012), we get a palindrome (41213122131214).

The spelling of 21001120021202 in words is "twenty-one trillion, one billion, one hundred twenty million, twenty-one thousand, two hundred two".