21213415164120 has 128 divisors (see below), whose sum is σ = 66412802327040. Its totient is φ = 5410502620160.

The previous prime is 21213415164047. The next prime is 21213415164121. The reversal of 21213415164120 is 2146151431212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213415164121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33097900 + ... + 33732740.

It is an arithmetic number, because the mean of its divisors is an integer number (518850018180).

Almost surely, 2^{21213415164120} is an apocalyptic number.

21213415164120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21213415164120 is an abundant number, since it is smaller than the sum of its proper divisors (45199387162920).

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

21213415164120 is a wasteful number, since it uses less digits than its factorization.

21213415164120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646985 (or 646981 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

Adding to 21213415164120 its reverse (2146151431212), we get a palindrome (23359566595332).

The spelling of 21213415164120 in words is "twenty-one trillion, two hundred thirteen billion, four hundred fifteen million, one hundred sixty-four thousand, one hundred twenty".