21231554353043 has 2 divisors, whose sum is σ = 21231554353044. Its totient is φ = 21231554353042.

The previous prime is 21231554352979. The next prime is 21231554353091. The reversal of 21231554353043 is 34035345513212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21231554353043 - 2⁶ = 21231554352979 is a prime.

It is not a weakly prime, because it can be changed into another prime (21231554356043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615777176521 + 10615777176522.

It is an arithmetic number, because the mean of its divisors is an integer number (10615777176522).

Almost surely, 2^{21231554353043} is an apocalyptic number.

21231554353043 is a deficient number, since it is larger than the sum of its proper divisors (1).

21231554353043 is an equidigital number, since it uses as much as digits as its factorization.

21231554353043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648000, while the sum is 41.

Adding to 21231554353043 its reverse (34035345513212), we get a palindrome (55266899866255).

The spelling of 21231554353043 in words is "twenty-one trillion, two hundred thirty-one billion, five hundred fifty-four million, three hundred fifty-three thousand, forty-three".