21234333451 has 2 divisors, whose sum is σ = 21234333452. Its totient is φ = 21234333450.

The previous prime is 21234333437. The next prime is 21234333541. The reversal of 21234333451 is 15433343212.

It is a happy number.

Together with next prime (21234333541) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21234333451 - 2¹⁵ = 21234300683 is a prime.

It is not a weakly prime, because it can be changed into another prime (21234333251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10617166725 + 10617166726.

It is an arithmetic number, because the mean of its divisors is an integer number (10617166726).

Almost surely, 2^21234333451 is an apocalyptic number.

21234333451 is a deficient number, since it is larger than the sum of its proper divisors (1).

21234333451 is an equidigital number, since it uses as much as digits as its factorization.

21234333451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 31.

Adding to 21234333451 its reverse (15433343212), we get a palindrome (36667676663).

The spelling of 21234333451 in words is "twenty-one billion, two hundred thirty-four million, three hundred thirty-three thousand, four hundred fifty-one".