21213415166356 has 48 divisors (see below), whose sum is σ = 43239104004096. Its totient is φ = 8919054847584.

The previous prime is 21213415166347. The next prime is 21213415166399. The reversal of 21213415166356 is 65366151431212.

It is a congruent number.

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, 34063156 + ... + 34680331.

It is an arithmetic number, because the mean of its divisors is an integer number (900814666752).

Almost surely, 2^{21213415166356} is an apocalyptic number.

It is an amenable number.

21213415166356 is an abundant number, since it is smaller than the sum of its proper divisors (22025688837740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21213415166356 is a wasteful number, since it uses less digits than its factorization.

21213415166356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68743708 (or 68743706 counting only the distinct ones).

The product of its digits is 777600, while the sum is 46.

Adding to 21213415166356 its reverse (65366151431212), we get a palindrome (86579566597568).

The spelling of 21213415166356 in words is "twenty-one trillion, two hundred thirteen billion, four hundred fifteen million, one hundred sixty-six thousand, three hundred fifty-six".