21619061 has 8 divisors (see below), whose sum is σ = 22070400. Its totient is φ = 21172320.

The previous prime is 21619051. The next prime is 21619109. The reversal of 21619061 is 16091612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21619061 - 2¹⁸ = 21356917 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21619061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21619021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9305 + ... + 11393.

It is an arithmetic number, because the mean of its divisors is an integer number (2758800).

Almost surely, 2^21619061 is an apocalyptic number.

It is an amenable number.

21619061 is a deficient number, since it is larger than the sum of its proper divisors (451339).

21619061 is a wasteful number, since it uses less digits than its factorization.

21619061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2299.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 21619061 is about 4649.6302003493. The cubic root of 21619061 is about 278.5772256769.

The spelling of 21619061 in words is "twenty-one million, six hundred nineteen thousand, sixty-one".