21194886613572 has 144 divisors (see below), whose sum is σ = 61505748595200. Its totient is φ = 6028394077440.

The previous prime is 21194886613561. The next prime is 21194886613591. The reversal of 21194886613572 is 27531668849112.

It is a happy number.

21194886613572 is a `hidden beast` number, since 2 + 1 + 1 + 9 + 4 + 8 + 8 + 6 + 613 + 5 + 7 + 2 = 666.

It is a super-3 number, since 3×21194886613572³ (a number of 41 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 191529954 + ... + 191640582.

Almost surely, 2^{21194886613572} 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 21194886613572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30752874297600).

21194886613572 is an abundant number, since it is smaller than the sum of its proper divisors (40310861981628).

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

21194886613572 is a wasteful number, since it uses less digits than its factorization.

21194886613572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114066 (or 114061 counting only the distinct ones).

The product of its digits is 34836480, while the sum is 63.

The spelling of 21194886613572 in words is "twenty-one trillion, one hundred ninety-four billion, eight hundred eighty-six million, six hundred thirteen thousand, five hundred seventy-two".