21111002033 has 16 divisors (see below), whose sum is σ = 24441310656. Its totient is φ = 18021104640.

The previous prime is 21111001993. The next prime is 21111002039. The reversal of 21111002033 is 33020011112.

It is not a de Polignac number, because 21111002033 - 2⁶ = 21111001969 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21111001999 and 21111002017.

It is not an unprimeable number, because it can be changed into a prime (21111002039) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49391 + ... + 211332.

It is an arithmetic number, because the mean of its divisors is an integer number (1527581916).

Almost surely, 2^21111002033 is an apocalyptic number.

It is an amenable number.

21111002033 is a deficient number, since it is larger than the sum of its proper divisors (3330308623).

21111002033 is a wasteful number, since it uses less digits than its factorization.

21111002033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261184.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21111002033 its reverse (33020011112), we get a palindrome (54131013145).

The spelling of 21111002033 in words is "twenty-one billion, one hundred eleven million, two thousand, thirty-three".