19621116 has 60 divisors (see below), whose sum is σ = 53543952. Its totient is φ = 6253632.

The previous prime is 19621103. The next prime is 19621153. The reversal of 19621116 is 61112691.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 19621116.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6136 + ... + 8768.

Almost surely, 2^19621116 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19621116, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26771976).

19621116 is an abundant number, since it is smaller than the sum of its proper divisors (33922836).

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

19621116 is a wasteful number, since it uses less digits than its factorization.

19621116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2672 (or 2661 counting only the distinct ones).

The product of its digits is 648, while the sum is 27.

The square root of 19621116 is about 4429.5728913745. The cubic root of 19621116 is about 269.7167399697.

It can be divided in two parts, 196 and 21116, that added together give a palindrome (21312).

The spelling of 19621116 in words is "nineteen million, six hundred twenty-one thousand, one hundred sixteen".