21211348 has 6 divisors (see below), whose sum is σ = 37119866. Its totient is φ = 10605672.

The previous prime is 21211339. The next prime is 21211363. The reversal of 21211348 is 84311212.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 21049744 + 161604 = 4588^2 + 402^2 .

It is a congruent number.

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 as a sum of consecutive naturals, namely, 2651415 + ... + 2651422.

Almost surely, 2^21211348 is an apocalyptic number.

It is an amenable number.

21211348 is a deficient number, since it is larger than the sum of its proper divisors (15908518).

21211348 is a wasteful number, since it uses less digits than its factorization.

21211348 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5302841 (or 5302839 counting only the distinct ones).

The product of its digits is 384, while the sum is 22.

The square root of 21211348 is about 4605.5779224762. The cubic root of 21211348 is about 276.8148745445.

The spelling of 21211348 in words is "twenty-one million, two hundred eleven thousand, three hundred forty-eight".