21772801 has 8 divisors (see below), whose sum is σ = 23104224. Its totient is φ = 20447040.

The previous prime is 21772787. The next prime is 21772811. The reversal of 21772801 is 10827712.

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 21772801 - 2⁵ = 21772769 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21772801.

It is not an unprimeable number, because it can be changed into a prime (21772811) 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, 8586 + ... + 10828.

It is an arithmetic number, because the mean of its divisors is an integer number (2888028).

Almost surely, 2^21772801 is an apocalyptic number.

It is an amenable number.

21772801 is a deficient number, since it is larger than the sum of its proper divisors (1331423).

21772801 is a wasteful number, since it uses less digits than its factorization.

21772801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2831.

The product of its (nonzero) digits is 1568, while the sum is 28.

The square root of 21772801 is about 4666.1334100088. The cubic root of 21772801 is about 279.2360168491.

The spelling of 21772801 in words is "twenty-one million, seven hundred seventy-two thousand, eight hundred one".