21348356 has 6 divisors (see below), whose sum is σ = 37359630. Its totient is φ = 10674176.

The previous prime is 21348329. The next prime is 21348361. The reversal of 21348356 is 65384312.

It can be written as a sum of positive squares in only one way, i.e., 21160000 + 188356 = 4600^2 + 434^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2668541 + ... + 2668548.

It is an arithmetic number, because the mean of its divisors is an integer number (6226605).

Almost surely, 2^21348356 is an apocalyptic number.

It is an amenable number.

21348356 is a deficient number, since it is larger than the sum of its proper divisors (16011274).

21348356 is a wasteful number, since it uses less digits than its factorization.

21348356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5337093 (or 5337091 counting only the distinct ones).

The product of its digits is 17280, while the sum is 32.

The square root of 21348356 is about 4620.4281186920. The cubic root of 21348356 is about 277.4095953108.

The spelling of 21348356 in words is "twenty-one million, three hundred forty-eight thousand, three hundred fifty-six".