20421520110216 has 48 divisors (see below), whose sum is σ = 55308900142860. Its totient is φ = 6807097491840.

The previous prime is 20421520110209. The next prime is 20421520110247. The reversal of 20421520110216 is 61201102512402.

It is a happy number.

20421520110216 is a `hidden beast` number, since 2 + 0 + 4 + 2 + 1 + 520 + 110 + 21 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19876920389316 + 544599720900 = 4458354^2 + 737970^2 .

It is a super-2 number, since 2×20421520110216² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20421520110216.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5119146 + ... + 8188326.

Almost surely, 2^{20421520110216} is an apocalyptic number.

It is an amenable number.

20421520110216 is an abundant number, since it is smaller than the sum of its proper divisors (34887380032644).

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

20421520110216 is a wasteful number, since it uses less digits than its factorization.

20421520110216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3161606 (or 3161599 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

Adding to 20421520110216 its reverse (61201102512402), we get a palindrome (81622622622618).

The spelling of 20421520110216 in words is "twenty trillion, four hundred twenty-one billion, five hundred twenty million, one hundred ten thousand, two hundred sixteen".