21357346 has 8 divisors (see below), whose sum is σ = 32055660. Its totient is φ = 10672128.

The previous prime is 21357331. The next prime is 21357377. The reversal of 21357346 is 64375312.

It can be written as a sum of positive squares in 2 ways, for example, as 21206025 + 151321 = 4605^2 + 389^2 .

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

It is a super-2 number, since 2×21357346² = 912272456327432, 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 3 ways as a sum of consecutive naturals, for example, 4450 + ... + 7906.

Almost surely, 2^21357346 is an apocalyptic number.

21357346 is a deficient number, since it is larger than the sum of its proper divisors (10698314).

21357346 is a wasteful number, since it uses less digits than its factorization.

21357346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6548.

The product of its digits is 15120, while the sum is 31.

The square root of 21357346 is about 4621.4008698662. The cubic root of 21357346 is about 277.4485298042.

The spelling of 21357346 in words is "twenty-one million, three hundred fifty-seven thousand, three hundred forty-six".