21774142 has 8 divisors (see below), whose sum is σ = 35173656. Its totient is φ = 10049592.

The previous prime is 21774131. The next prime is 21774143. The reversal of 21774142 is 24147712.

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

It is a super-2 number, since 2×21774142² = 948226519672328, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21774142.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21774143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 418708 + ... + 418759.

It is an arithmetic number, because the mean of its divisors is an integer number (4396707).

Almost surely, 2^21774142 is an apocalyptic number.

21774142 is a deficient number, since it is larger than the sum of its proper divisors (13399514).

21774142 is a wasteful number, since it uses less digits than its factorization.

21774142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837482.

The product of its digits is 3136, while the sum is 28.

The square root of 21774142 is about 4666.2771027876. The cubic root of 21774142 is about 279.2417495032.

The spelling of 21774142 in words is "twenty-one million, seven hundred seventy-four thousand, one hundred forty-two".