21675189492 has 120 divisors (see below), whose sum is σ = 62661954432. Its totient is φ = 6478185600.

The previous prime is 21675189427. The next prime is 21675189509. The reversal of 21675189492 is 29498157612.

It is a happy number.

21675189492 is a `hidden beast` number, since 2 + 1 + 6 + 75 + 1 + 89 + 492 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

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 39 ways as a sum of consecutive naturals, for example, 218517 + ... + 301827.

Almost surely, 2^21675189492 is an apocalyptic number.

21675189492 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21675189492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31330977216).

21675189492 is an abundant number, since it is smaller than the sum of its proper divisors (40986764940).

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

21675189492 is a wasteful number, since it uses less digits than its factorization.

21675189492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83411 (or 83400 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The spelling of 21675189492 in words is "twenty-one billion, six hundred seventy-five million, one hundred eighty-nine thousand, four hundred ninety-two".