21020011200111 has 16 divisors (see below), whose sum is σ = 34942356281088. Its totient is φ = 10919486337600.

The previous prime is 21020011200109. The next prime is 21020011200137. The reversal of 21020011200111 is 11100211002012.

It is not a de Polignac number, because 21020011200111 - 2¹ = 21020011200109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020011200161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45497859510 + ... + 45497859971.

It is an arithmetic number, because the mean of its divisors is an integer number (2183897267568).

Almost surely, 2^{21020011200111} is an apocalyptic number.

21020011200111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21020011200111 is a deficient number, since it is larger than the sum of its proper divisors (13922345080977).

21020011200111 is a wasteful number, since it uses less digits than its factorization.

21020011200111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90995719502.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21020011200111 its reverse (11100211002012), we get a palindrome (32120222202123).

The spelling of 21020011200111 in words is "twenty-one trillion, twenty billion, eleven million, two hundred thousand, one hundred eleven".