21020200202111 has 4 divisors (see below), whose sum is σ = 22931127493224. Its totient is φ = 19109272911000.

The previous prime is 21020200202077. The next prime is 21020200202117. The reversal of 21020200202111 is 11120200202012.

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

It is a cyclic number.

It is not a de Polignac number, because 21020200202111 - 2²² = 21020196007807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020200202117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 955463645540 + ... + 955463645561.

It is an arithmetic number, because the mean of its divisors is an integer number (5732781873306).

Almost surely, 2^{21020200202111} is an apocalyptic number.

21020200202111 is a deficient number, since it is larger than the sum of its proper divisors (1910927291113).

21020200202111 is a wasteful number, since it uses less digits than its factorization.

21020200202111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1910927291112.

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

Adding to 21020200202111 its reverse (11120200202012), we get a palindrome (32140400404123).

Subtracting from 21020200202111 its reverse (11120200202012), we obtain a palindrome (9900000000099).

The spelling of 21020200202111 in words is "twenty-one trillion, twenty billion, two hundred million, two hundred two thousand, one hundred eleven".