21202020120111 has 16 divisors (see below), whose sum is σ = 28299055017600. Its totient is φ = 14119836443168.

The previous prime is 21202020120107. The next prime is 21202020120119. The reversal of 21202020120111 is 11102102020212.

It is a cyclic number.

It is not a de Polignac number, because 21202020120111 - 2² = 21202020120107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202020120119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22083700 + ... + 23023766.

It is an arithmetic number, because the mean of its divisors is an integer number (1768690938600).

Almost surely, 2^{21202020120111} is an apocalyptic number.

21202020120111 is a deficient number, since it is larger than the sum of its proper divisors (7097034897489).

21202020120111 is a wasteful number, since it uses less digits than its factorization.

21202020120111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 947958.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21202020120111 its reverse (11102102020212), we get a palindrome (32304122140323).

The spelling of 21202020120111 in words is "twenty-one trillion, two hundred two billion, twenty million, one hundred twenty thousand, one hundred eleven".