21019170401616 has 80 divisors (see below), whose sum is σ = 54353806723008. Its totient is φ = 6999389184000.

The previous prime is 21019170401569. The next prime is 21019170401617. The reversal of 21019170401616 is 61610407191012.

It is a super-2 number, since 2×21019170401616² (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 (21019170401617) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 210590475 + ... + 210690261.

Almost surely, 2^{21019170401616} is an apocalyptic number.

It is an amenable number.

21019170401616 is an abundant number, since it is smaller than the sum of its proper divisors (33334636321392).

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

21019170401616 is a wasteful number, since it uses less digits than its factorization.

21019170401616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104140 (or 104134 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 39.

Adding to 21019170401616 its reverse (61610407191012), we get a palindrome (82629577592628).

The spelling of 21019170401616 in words is "twenty-one trillion, nineteen billion, one hundred seventy million, four hundred one thousand, six hundred sixteen".