21474142 has 8 divisors (see below), whose sum is σ = 33906600. Its totient is φ = 10171944.

The previous prime is 21474139. The next prime is 21474143. The reversal of 21474142 is 24147412.

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

It is a super-2 number, since 2×21474142² = 922277549272328, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21474143) 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, 282517 + ... + 282592.

It is an arithmetic number, because the mean of its divisors is an integer number (4238325).

Almost surely, 2^21474142 is an apocalyptic number.

21474142 is a deficient number, since it is larger than the sum of its proper divisors (12432458).

21474142 is a wasteful number, since it uses less digits than its factorization.

21474142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565130.

The product of its digits is 1792, while the sum is 25.

The square root of 21474142 is about 4634.0200690114. The cubic root of 21474142 is about 277.9533676074.

The spelling of 21474142 in words is "twenty-one million, four hundred seventy-four thousand, one hundred forty-two".