21319011 has 16 divisors (see below), whose sum is σ = 36096000. Its totient is φ = 12182184.

The previous prime is 21318991. The next prime is 21319027. The reversal of 21319011 is 11091312.

It is not a de Polignac number, because 21319011 - 2¹³ = 21310819 is a prime.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (21319061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56211 + ... + 56588.

It is an arithmetic number, because the mean of its divisors is an integer number (2256000).

Almost surely, 2^21319011 is an apocalyptic number.

21319011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21319011 is a deficient number, since it is larger than the sum of its proper divisors (14776989).

21319011 is a wasteful number, since it uses less digits than its factorization.

21319011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112815 (or 112809 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 18.

The square root of 21319011 is about 4617.2514551408. The cubic root of 21319011 is about 277.2824299000.

The spelling of 21319011 in words is "twenty-one million, three hundred nineteen thousand, eleven".