21202120021102 has 4 divisors (see below), whose sum is σ = 31803180031656. Its totient is φ = 10601060010550.

The previous prime is 21202120021099. The next prime is 21202120021123. The reversal of 21202120021102 is 20112002120212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5300530005274 + ... + 5300530005277.

It is an arithmetic number, because the mean of its divisors is an integer number (7950795007914).

Almost surely, 2^{21202120021102} is an apocalyptic number.

21202120021102 is a deficient number, since it is larger than the sum of its proper divisors (10601060010554).

21202120021102 is a wasteful number, since it uses less digits than its factorization.

21202120021102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10601060010553.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21202120021102 its reverse (20112002120212), we get a palindrome (41314122141314).

The spelling of 21202120021102 in words is "twenty-one trillion, two hundred two billion, one hundred twenty million, twenty-one thousand, one hundred two".