21147402 has 8 divisors (see below), whose sum is σ = 42294816. Its totient is φ = 7049132.

The previous prime is 21147397. The next prime is 21147433. The reversal of 21147402 is 20474112.

It is a happy number.

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

21147402 is an admirable number.

It is a super-2 number, since 2×21147402² = 894425222699208, which contains 22 as substring.

It is a zygodrome in base 4.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1762278 + ... + 1762289.

It is an arithmetic number, because the mean of its divisors is an integer number (5286852).

Almost surely, 2^21147402 is an apocalyptic number.

21147402 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21147402 is a wasteful number, since it uses less digits than its factorization.

21147402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3524572.

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 21147402 is about 4598.6304482965. The cubic root of 21147402 is about 276.5364226234.

The spelling of 21147402 in words is "twenty-one million, one hundred forty-seven thousand, four hundred two".