21212110311 has 8 divisors (see below), whose sum is σ = 32323215744. Its totient is φ = 12121205880.

The previous prime is 21212110277. The next prime is 21212110319. The reversal of 21212110311 is 11301121212.

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

It is not a de Polignac number, because 21212110311 - 2⁹ = 21212109799 is a prime.

It is a super-3 number, since 3×21212110311³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212110319) 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, 505050225 + ... + 505050266.

It is an arithmetic number, because the mean of its divisors is an integer number (4040401968).

Almost surely, 2^21212110311 is an apocalyptic number.

21212110311 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21212110311 is a deficient number, since it is larger than the sum of its proper divisors (11111105433).

21212110311 is a wasteful number, since it uses less digits than its factorization.

21212110311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010100501.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21212110311 its reverse (11301121212), we get a palindrome (32513231523).

The spelling of 21212110311 in words is "twenty-one billion, two hundred twelve million, one hundred ten thousand, three hundred eleven".