21231435469 has 2 divisors, whose sum is σ = 21231435470. Its totient is φ = 21231435468.

The previous prime is 21231435451. The next prime is 21231435503. The reversal of 21231435469 is 96453413212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18100473444 + 3130962025 = 134538^2 + 55955^2 .

It is a cyclic number.

It is not a de Polignac number, because 21231435469 - 2³³ = 12641500877 is a prime.

It is a super-2 number, since 2×21231435469² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21231435419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615717734 + 10615717735.

It is an arithmetic number, because the mean of its divisors is an integer number (10615717735).

Almost surely, 2^21231435469 is an apocalyptic number.

It is an amenable number.

21231435469 is a deficient number, since it is larger than the sum of its proper divisors (1).

21231435469 is an equidigital number, since it uses as much as digits as its factorization.

21231435469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 40.

The spelling of 21231435469 in words is "twenty-one billion, two hundred thirty-one million, four hundred thirty-five thousand, four hundred sixty-nine".