21121151346434 has 8 divisors (see below), whose sum is σ = 32537989912188. Its totient is φ = 10275154709040.

The previous prime is 21121151346391. The next prime is 21121151346437. The reversal of 21121151346434 is 43464315112112.

It can be written as a sum of positive squares in 2 ways, for example, as 14040735927409 + 7080415419025 = 3747097^2 + 2660905^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21121151346434² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121151346437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142710481997 + ... + 142710482144.

Almost surely, 2^{21121151346434} is an apocalyptic number.

21121151346434 is a deficient number, since it is larger than the sum of its proper divisors (11416838565754).

21121151346434 is a wasteful number, since it uses less digits than its factorization.

21121151346434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285420964180.

The product of its digits is 69120, while the sum is 38.

Adding to 21121151346434 its reverse (43464315112112), we get a palindrome (64585466458546).

The spelling of 21121151346434 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred fifty-one million, three hundred forty-six thousand, four hundred thirty-four".