21214011 has 48 divisors (see below), whose sum is σ = 37576224. Its totient is φ = 10515456.

The previous prime is 21214003. The next prime is 21214021. The reversal of 21214011 is 11041212.

It is a happy number.

It is not a de Polignac number, because 21214011 - 2³ = 21214003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21214001) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 32161 + ... + 32813.

It is an arithmetic number, because the mean of its divisors is an integer number (782838).

Almost surely, 2^21214011 is an apocalyptic number.

21214011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21214011 is a deficient number, since it is larger than the sum of its proper divisors (16362213).

21214011 is a wasteful number, since it uses less digits than its factorization.

21214011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700 (or 693 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 21214011 is about 4605.8670193569. The cubic root of 21214011 is about 276.8264583936.

Adding to 21214011 its reverse (11041212), we get a palindrome (32255223).

The spelling of 21214011 in words is "twenty-one million, two hundred fourteen thousand, eleven".