21213543315074 has 36 divisors (see below), whose sum is σ = 37154487830082. Its totient is φ = 9075312618240.

The previous prime is 21213543315073. The next prime is 21213543315143. The reversal of 21213543315074 is 47051334531212.

It can be written as a sum of positive squares in 3 ways, for example, as 20193025132225 + 1020518182849 = 4493665^2 + 1010207^2 .

It is not an unprimeable number, because it can be changed into a prime (21213543315073) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 151589699 + ... + 151729574.

Almost surely, 2^{21213543315074} is an apocalyptic number.

21213543315074 is a deficient number, since it is larger than the sum of its proper divisors (15940944515008).

21213543315074 is a wasteful number, since it uses less digits than its factorization.

21213543315074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303319331 (or 303319303 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 41.

Adding to 21213543315074 its reverse (47051334531212), we get a palindrome (68264877846286).

The spelling of 21213543315074 in words is "twenty-one trillion, two hundred thirteen billion, five hundred forty-three million, three hundred fifteen thousand, seventy-four".