21011245833 has 32 divisors (see below), whose sum is σ = 29277050752. Its totient is φ = 13390272000.

The previous prime is 21011245831. The next prime is 21011245841. The reversal of 21011245833 is 33854211012.

It is not a de Polignac number, because 21011245833 - 2¹ = 21011245831 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21011245833.

It is not an unprimeable number, because it can be changed into a prime (21011245831) 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, 11665533 + ... + 11667333.

It is an arithmetic number, because the mean of its divisors is an integer number (914907836).

Almost surely, 2^21011245833 is an apocalyptic number.

It is an amenable number.

21011245833 is a deficient number, since it is larger than the sum of its proper divisors (8265804919).

21011245833 is a wasteful number, since it uses less digits than its factorization.

21011245833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3625.

The product of its (nonzero) digits is 5760, while the sum is 30.

Adding to 21011245833 its reverse (33854211012), we get a palindrome (54865456845).

The spelling of 21011245833 in words is "twenty-one billion, eleven million, two hundred forty-five thousand, eight hundred thirty-three".