21033020354431 has 2 divisors, whose sum is σ = 21033020354432. Its totient is φ = 21033020354430.

The previous prime is 21033020354417. The next prime is 21033020354443. The reversal of 21033020354431 is 13445302033012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21033020354431 - 2⁷ = 21033020354303 is a prime.

It is a super-2 number, since 2×21033020354431² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21033020354393 and 21033020354402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21033020358431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10516510177215 + 10516510177216.

It is an arithmetic number, because the mean of its divisors is an integer number (10516510177216).

Almost surely, 2^{21033020354431} is an apocalyptic number.

21033020354431 is a deficient number, since it is larger than the sum of its proper divisors (1).

21033020354431 is an equidigital number, since it uses as much as digits as its factorization.

21033020354431 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21033020354431 its reverse (13445302033012), we get a palindrome (34478322387443).

The spelling of 21033020354431 in words is "twenty-one trillion, thirty-three billion, twenty million, three hundred fifty-four thousand, four hundred thirty-one".