21210300111 has 64 divisors (see below), whose sum is σ = 39280389120. Its totient is φ = 9820016640.

The previous prime is 21210300109. The next prime is 21210300157. The reversal of 21210300111 is 11100301212.

It is not a de Polignac number, because 21210300111 - 2¹ = 21210300109 is a prime.

It is a super-2 number, since 2×21210300111² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210300211) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 34690 + ... + 208863.

It is an arithmetic number, because the mean of its divisors is an integer number (613756080).

Almost surely, 2^21210300111 is an apocalyptic number.

21210300111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21210300111 is a deficient number, since it is larger than the sum of its proper divisors (18070089009).

21210300111 is a wasteful number, since it uses less digits than its factorization.

21210300111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243616.

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

Adding to 21210300111 its reverse (11100301212), we get a palindrome (32310601323).

The spelling of 21210300111 in words is "twenty-one billion, two hundred ten million, three hundred thousand, one hundred eleven".