21110212011 has 32 divisors (see below), whose sum is σ = 33832194048. Its totient is φ = 11453569920.

The previous prime is 21110212003. The next prime is 21110212099. The reversal of 21110212011 is 11021201112.

It is not a de Polignac number, because 21110212011 - 2³ = 21110212003 is a prime.

It is a super-2 number, since 2×21110212011² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21110312011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 271416 + ... + 340421.

It is an arithmetic number, because the mean of its divisors is an integer number (1057256064).

Almost surely, 2^21110212011 is an apocalyptic number.

21110212011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21110212011 is a deficient number, since it is larger than the sum of its proper divisors (12721982037).

21110212011 is a wasteful number, since it uses less digits than its factorization.

21110212011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611931.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21110212011 its reverse (11021201112), we get a palindrome (32131413123).

The spelling of 21110212011 in words is "twenty-one billion, one hundred ten million, two hundred twelve thousand, eleven".