21011719 has 8 divisors (see below), whose sum is σ = 22044672. Its totient is φ = 19988760.

The previous prime is 21011713. The next prime is 21011741. The reversal of 21011719 is 91711012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21011719 - 2¹³ = 21003527 is a prime.

It is a super-2 number, since 2×21011719² = 882984670669922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21011719.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011713) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2002 + ... + 6784.

It is an arithmetic number, because the mean of its divisors is an integer number (2755584).

Almost surely, 2^21011719 is an apocalyptic number.

21011719 is a deficient number, since it is larger than the sum of its proper divisors (1032953).

21011719 is a wasteful number, since it uses less digits than its factorization.

21011719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4997.

The product of its (nonzero) digits is 126, while the sum is 22.

The square root of 21011719 is about 4583.8541643469. The cubic root of 21011719 is about 275.9437284636.

The spelling of 21011719 in words is "twenty-one million, eleven thousand, seven hundred nineteen".