21333474 has 24 divisors (see below), whose sum is σ = 46523100. Its totient is φ = 7064928.

The previous prime is 21333467. The next prime is 21333491. The reversal of 21333474 is 47433312.

It can be written as a sum of positive squares in 2 ways, for example, as 21206025 + 127449 = 4605^2 + 357^2 .

It is a super-2 number, since 2×21333474² = 910234225817352, which contains 22 as substring.

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 11 ways as a sum of consecutive naturals, for example, 949 + ... + 6600.

Almost surely, 2^21333474 is an apocalyptic number.

21333474 is an abundant number, since it is smaller than the sum of its proper divisors (25189626).

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

21333474 is a wasteful number, since it uses less digits than its factorization.

21333474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7714 (or 7711 counting only the distinct ones).

The product of its digits is 6048, while the sum is 27.

The square root of 21333474 is about 4618.8173811053. The cubic root of 21333474 is about 277.3451193190.

Adding to 21333474 its reverse (47433312), we get a palindrome (68766786).

The spelling of 21333474 in words is "twenty-one million, three hundred thirty-three thousand, four hundred seventy-four".