21033331011 has 48 divisors (see below), whose sum is σ = 37901260800. Its totient is φ = 10919756160.

The previous prime is 21033330979. The next prime is 21033331013. The reversal of 21033331011 is 11013333012.

It is a happy number.

21033331011 is a `hidden beast` number, since 2 + 10 + 333 + 310 + 11 = 666.

It is not a de Polignac number, because 21033331011 - 2⁵ = 21033330979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21033331013) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1255015 + ... + 1271663.

It is an arithmetic number, because the mean of its divisors is an integer number (789609600).

Almost surely, 2^21033331011 is an apocalyptic number.

21033331011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21033331011 is a deficient number, since it is larger than the sum of its proper divisors (16867929789).

21033331011 is a wasteful number, since it uses less digits than its factorization.

21033331011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18496 (or 18493 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

Adding to 21033331011 its reverse (11013333012), we get a palindrome (32046664023).

The spelling of 21033331011 in words is "twenty-one billion, thirty-three million, three hundred thirty-one thousand, eleven".