21213420142466 has 16 divisors (see below), whose sum is σ = 31963075804800. Its totient is φ = 10559088782928.

The previous prime is 21213420142429. The next prime is 21213420142483. The reversal of 21213420142466 is 66424102431212.

It is a super-2 number, since 2×21213420142466² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5250965 + ... + 8366568.

It is an arithmetic number, because the mean of its divisors is an integer number (1997692237800).

Almost surely, 2^{21213420142466} is an apocalyptic number.

21213420142466 is a deficient number, since it is larger than the sum of its proper divisors (10749655662334).

21213420142466 is a wasteful number, since it uses less digits than its factorization.

21213420142466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13621033.

The product of its (nonzero) digits is 110592, while the sum is 38.

Adding to 21213420142466 its reverse (66424102431212), we get a palindrome (87637522573678).

The spelling of 21213420142466 in words is "twenty-one trillion, two hundred thirteen billion, four hundred twenty million, one hundred forty-two thousand, four hundred sixty-six".