21799641 has 8 divisors (see below), whose sum is σ = 29348800. Its totient is φ = 14391792.

The previous prime is 21799639. The next prime is 21799643. The reversal of 21799641 is 14699712.

It is an interprime number because it is at equal distance from previous prime (21799639) and next prime (21799643).

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

It is not a de Polignac number, because 21799641 - 2¹ = 21799639 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 21799641.

It is not an unprimeable number, because it can be changed into a prime (21799643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34966 + ... + 35583.

It is an arithmetic number, because the mean of its divisors is an integer number (3668600).

Almost surely, 2^21799641 is an apocalyptic number.

It is an amenable number.

21799641 is a deficient number, since it is larger than the sum of its proper divisors (7549159).

21799641 is a wasteful number, since it uses less digits than its factorization.

21799641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70655.

The product of its digits is 27216, while the sum is 39.

The square root of 21799641 is about 4669.0085671371. The cubic root of 21799641 is about 279.3507106690.

The spelling of 21799641 in words is "twenty-one million, seven hundred ninety-nine thousand, six hundred forty-one".