21213543353146 has 32 divisors (see below), whose sum is σ = 32077678620672. Its totient is φ = 10521316016640.

The previous prime is 21213543353143. The next prime is 21213543353147. The reversal of 21213543353146 is 64135334531212.

It is not an unprimeable number, because it can be changed into a prime (21213543353141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 516664650 + ... + 516705706.

It is an arithmetic number, because the mean of its divisors is an integer number (1002427456896).

Almost surely, 2^{21213543353146} is an apocalyptic number.

21213543353146 is a deficient number, since it is larger than the sum of its proper divisors (10864135267526).

21213543353146 is a wasteful number, since it uses less digits than its factorization.

21213543353146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45054.

The product of its digits is 777600, while the sum is 43.

Adding to 21213543353146 its reverse (64135334531212), we get a palindrome (85348877884358).

The spelling of 21213543353146 in words is "twenty-one trillion, two hundred thirteen billion, five hundred forty-three million, three hundred fifty-three thousand, one hundred forty-six".