21799011 has 16 divisors (see below), whose sum is σ = 31497984. Its totient is φ = 13330464.

The previous prime is 21798991. The next prime is 21799033. The reversal of 21799011 is 11099712.

It is not a de Polignac number, because 21799011 - 2⁹ = 21798499 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21799011.

It is not an unprimeable number, because it can be changed into a prime (21799051) 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, 4840 + ... + 8186.

It is an arithmetic number, because the mean of its divisors is an integer number (1968624).

Almost surely, 2^21799011 is an apocalyptic number.

21799011 is a deficient number, since it is larger than the sum of its proper divisors (9698973).

21799011 is a wasteful number, since it uses less digits than its factorization.

21799011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3530.

The product of its (nonzero) digits is 1134, while the sum is 30.

The square root of 21799011 is about 4668.9411005066. The cubic root of 21799011 is about 279.3480196057.

The spelling of 21799011 in words is "twenty-one million, seven hundred ninety-nine thousand, eleven".