21012200221111 has 8 divisors (see below), whose sum is σ = 23919026338944. Its totient is φ = 18271478452920.

The previous prime is 21012200221081. The next prime is 21012200221139. The reversal of 21012200221111 is 11112200221012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21012200221111 - 2¹¹ = 21012200219063 is a prime.

It is a super-4 number, since 4×21012200221111⁴ (a number of 54 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012200221511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41526087141 + ... + 41526087646.

It is an arithmetic number, because the mean of its divisors is an integer number (2989878292368).

Almost surely, 2^{21012200221111} is an apocalyptic number.

21012200221111 is a deficient number, since it is larger than the sum of its proper divisors (2906826117833).

21012200221111 is a wasteful number, since it uses less digits than its factorization.

21012200221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83052174821.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21012200221111 its reverse (11112200221012), we get a palindrome (32124400442123).

Subtracting from 21012200221111 its reverse (11112200221012), we obtain a palindrome (9900000000099).

The spelling of 21012200221111 in words is "twenty-one trillion, twelve billion, two hundred million, two hundred twenty-one thousand, one hundred eleven".