16406223411021 has 16 divisors (see below), whose sum is σ = 21984030858240. Its totient is φ = 10883060984880.

The previous prime is 16406223411013. The next prime is 16406223411023. The reversal of 16406223411021 is 12011432260461.

It is a happy number.

It is not a de Polignac number, because 16406223411021 - 2³ = 16406223411013 is a prime.

It is a super-2 number, since 2×16406223411021² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16406223411023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13396101 + ... + 14569418.

It is an arithmetic number, because the mean of its divisors is an integer number (1374001928640).

Almost surely, 2^{16406223411021} is an apocalyptic number.

It is an amenable number.

16406223411021 is a deficient number, since it is larger than the sum of its proper divisors (5577807447219).

16406223411021 is a wasteful number, since it uses less digits than its factorization.

16406223411021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27966496.

The product of its (nonzero) digits is 13824, while the sum is 33.

Adding to 16406223411021 its reverse (12011432260461), we get a palindrome (28417655671482).

The spelling of 16406223411021 in words is "sixteen trillion, four hundred six billion, two hundred twenty-three million, four hundred eleven thousand, twenty-one".