21211076 has 6 divisors (see below), whose sum is σ = 37119390. Its totient is φ = 10605536.

The previous prime is 21211039. The next prime is 21211079. The reversal of 21211076 is 67011212.

It can be written as a sum of positive squares in only one way, i.e., 21160000 + 51076 = 4600^2 + 226^2 .

It is not an unprimeable number, because it can be changed into a prime (21211079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2651381 + ... + 2651388.

It is an arithmetic number, because the mean of its divisors is an integer number (6186565).

Almost surely, 2^21211076 is an apocalyptic number.

It is an amenable number.

21211076 is a deficient number, since it is larger than the sum of its proper divisors (15908314).

21211076 is a wasteful number, since it uses less digits than its factorization.

21211076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5302773 (or 5302771 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 21211076 is about 4605.5483929712. The cubic root of 21211076 is about 276.8136913105.

Adding to 21211076 its reverse (67011212), we get a palindrome (88222288).

The spelling of 21211076 in words is "twenty-one million, two hundred eleven thousand, seventy-six".