21044123051 has 24 divisors (see below), whose sum is σ = 24703218144. Its totient is φ = 17874017280.

The previous prime is 21044122973. The next prime is 21044123057. The reversal of 21044123051 is 15032144012.

It is not a de Polignac number, because 21044123051 - 2²² = 21039928747 is a prime.

It is a super-2 number, since 2×21044123051² (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 (21044123057) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2482961 + ... + 2491421.

It is an arithmetic number, because the mean of its divisors is an integer number (1029300756).

Almost surely, 2^21044123051 is an apocalyptic number.

21044123051 is a deficient number, since it is larger than the sum of its proper divisors (3659095093).

21044123051 is a wasteful number, since it uses less digits than its factorization.

21044123051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8931 (or 8924 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 21044123051 its reverse (15032144012), we get a palindrome (36076267063).

The spelling of 21044123051 in words is "twenty-one billion, forty-four million, one hundred twenty-three thousand, fifty-one".