21432241451 has 2 divisors, whose sum is σ = 21432241452. Its totient is φ = 21432241450.

The previous prime is 21432241427. The next prime is 21432241487. The reversal of 21432241451 is 15414223412.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21432241451 - 2⁶ = 21432241387 is a prime.

It is a super-2 number, since 2×21432241451² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21432241351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10716120725 + 10716120726.

It is an arithmetic number, because the mean of its divisors is an integer number (10716120726).

Almost surely, 2^21432241451 is an apocalyptic number.

21432241451 is a deficient number, since it is larger than the sum of its proper divisors (1).

21432241451 is an equidigital number, since it uses as much as digits as its factorization.

21432241451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7680, while the sum is 29.

Adding to 21432241451 its reverse (15414223412), we get a palindrome (36846464863).

The spelling of 21432241451 in words is "twenty-one billion, four hundred thirty-two million, two hundred forty-one thousand, four hundred fifty-one".