21024122051 has 4 divisors (see below), whose sum is σ = 21024438600. Its totient is φ = 21023805504.

The previous prime is 21024122029. The next prime is 21024122057. The reversal of 21024122051 is 15022142012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21024122051 - 2¹⁸ = 21023859907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21024122057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16046 + ... + 205683.

It is an arithmetic number, because the mean of its divisors is an integer number (5256109650).

Almost surely, 2^21024122051 is an apocalyptic number.

21024122051 is a deficient number, since it is larger than the sum of its proper divisors (316549).

21024122051 is an equidigital number, since it uses as much as digits as its factorization.

21024122051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316548.

The product of its (nonzero) digits is 320, while the sum is 20.

Adding to 21024122051 its reverse (15022142012), we get a palindrome (36046264063).

The spelling of 21024122051 in words is "twenty-one billion, twenty-four million, one hundred twenty-two thousand, fifty-one".