21434350516442 has 32 divisors (see below), whose sum is σ = 34441575665040. Its totient is φ = 9968953676800.

The previous prime is 21434350516367. The next prime is 21434350516471. The reversal of 21434350516442 is 24461505343412.

It can be written as a sum of positive squares in 8 ways, for example, as 17668495898881 + 3765854617561 = 4203391^2 + 1940581^2 .

It is a super-2 number, since 2×21434350516442² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21434350516393 and 21434350516402.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3690317 + ... + 7515792.

Almost surely, 2^{21434350516442} is an apocalyptic number.

21434350516442 is a deficient number, since it is larger than the sum of its proper divisors (13007225148598).

21434350516442 is a wasteful number, since it uses less digits than its factorization.

21434350516442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11206786.

The product of its (nonzero) digits is 1382400, while the sum is 44.

Adding to 21434350516442 its reverse (24461505343412), we get a palindrome (45895855859854).

The spelling of 21434350516442 in words is "twenty-one trillion, four hundred thirty-four billion, three hundred fifty million, five hundred sixteen thousand, four hundred forty-two".