21021101201111 has 16 divisors (see below), whose sum is σ = 23723061766560. Its totient is φ = 18450976360320.

The previous prime is 21021101201081. The next prime is 21021101201117. The reversal of 21021101201111 is 11110210112012.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21021101201111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021101201117) 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, 66184961 + ... + 66501813.

It is an arithmetic number, because the mean of its divisors is an integer number (1482691360410).

Almost surely, 2^{21021101201111} is an apocalyptic number.

21021101201111 is a deficient number, since it is larger than the sum of its proper divisors (2701960565449).

21021101201111 is a wasteful number, since it uses less digits than its factorization.

21021101201111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524866.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21021101201111 its reverse (11110210112012), we get a palindrome (32131311313123).

It can be divided in two parts, 21021101 and 201111, that added together give a palindrome (21222212).

The spelling of 21021101201111 in words is "twenty-one trillion, twenty-one billion, one hundred one million, two hundred one thousand, one hundred eleven".