21052261123 has 8 divisors (see below), whose sum is σ = 21992364288. Its totient is φ = 20114223624.

The previous prime is 21052261121. The next prime is 21052261133. The reversal of 21052261123 is 32116225012.

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

It is a cyclic number.

It is not a de Polignac number, because 21052261123 - 2¹ = 21052261121 is a prime.

It is a super-2 number, since 2×21052261123² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21052261121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 495561 + ... + 536362.

It is an arithmetic number, because the mean of its divisors is an integer number (2749045536).

Almost surely, 2^21052261123 is an apocalyptic number.

21052261123 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21052261123 is a deficient number, since it is larger than the sum of its proper divisors (940103165).

21052261123 is a wasteful number, since it uses less digits than its factorization.

21052261123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1032833.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 21052261123 its reverse (32116225012), we get a palindrome (53168486135).

The spelling of 21052261123 in words is "twenty-one billion, fifty-two million, two hundred sixty-one thousand, one hundred twenty-three".