21213404422016 has 64 divisors (see below), whose sum is σ = 44756704586880. Its totient is φ = 9994115163648.

The previous prime is 21213404421983. The next prime is 21213404422073. The reversal of 21213404422016 is 61022440431212.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53576186 + ... + 53970681.

It is an arithmetic number, because the mean of its divisors is an integer number (699323509170).

Almost surely, 2^{21213404422016} is an apocalyptic number.

It is an amenable number.

21213404422016 is an abundant number, since it is smaller than the sum of its proper divisors (23543300164864).

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

21213404422016 is a wasteful number, since it uses less digits than its factorization.

21213404422016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107546971 (or 107546959 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 32.

Adding to 21213404422016 its reverse (61022440431212), we get a palindrome (82235844853228).

The spelling of 21213404422016 in words is "twenty-one trillion, two hundred thirteen billion, four hundred four million, four hundred twenty-two thousand, sixteen".