21142334251 has 8 divisors (see below), whose sum is σ = 21546861840. Its totient is φ = 20738014752.

The previous prime is 21142334233. The next prime is 21142334267. The reversal of 21142334251 is 15243324112.

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 21142334251 - 2⁵ = 21142334219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21142334201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161416 + ... + 261418.

It is an arithmetic number, because the mean of its divisors is an integer number (2693357730).

Almost surely, 2^21142334251 is an apocalyptic number.

21142334251 is a deficient number, since it is larger than the sum of its proper divisors (404527589).

21142334251 is a wasteful number, since it uses less digits than its factorization.

21142334251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104045.

The product of its digits is 5760, while the sum is 28.

Adding to 21142334251 its reverse (15243324112), we get a palindrome (36385658363).

The spelling of 21142334251 in words is "twenty-one billion, one hundred forty-two million, three hundred thirty-four thousand, two hundred fifty-one".