21774801 has 16 divisors (see below), whose sum is σ = 29623104. Its totient is φ = 14224704.

The previous prime is 21774793. The next prime is 21774811. The reversal of 21774801 is 10847712.

It is not a de Polignac number, because 21774801 - 2³ = 21774793 is a prime.

It is a super-3 number, since 3×21774801³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21774811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38815 + ... + 39371.

It is an arithmetic number, because the mean of its divisors is an integer number (1851444).

Almost surely, 2^21774801 is an apocalyptic number.

It is an amenable number.

21774801 is a deficient number, since it is larger than the sum of its proper divisors (7848303).

21774801 is a wasteful number, since it uses less digits than its factorization.

21774801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800.

The product of its (nonzero) digits is 3136, while the sum is 30.

The square root of 21774801 is about 4666.3477152908. The cubic root of 21774801 is about 279.2445665825.

The spelling of 21774801 in words is "twenty-one million, seven hundred seventy-four thousand, eight hundred one".