21111300212 has 6 divisors (see below), whose sum is σ = 36944775378. Its totient is φ = 10555650104.

The previous prime is 21111300193. The next prime is 21111300233. The reversal of 21111300212 is 21200311112.

It can be written as a sum of positive squares in only one way, i.e., 21060975376 + 50324836 = 145124^2 + 7094^2 .

It is a super-3 number, since 3×21111300212³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2638912523 + ... + 2638912530.

It is an arithmetic number, because the mean of its divisors is an integer number (6157462563).

Almost surely, 2^21111300212 is an apocalyptic number.

It is an amenable number.

21111300212 is a deficient number, since it is larger than the sum of its proper divisors (15833475166).

21111300212 is a wasteful number, since it uses less digits than its factorization.

21111300212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5277825057 (or 5277825055 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21111300212 its reverse (21200311112), we get a palindrome (42311611324).

The spelling of 21111300212 in words is "twenty-one billion, one hundred eleven million, three hundred thousand, two hundred twelve".