21739119 has 16 divisors (see below), whose sum is σ = 29652864. Its totient is φ = 14162400.

The previous prime is 21739103. The next prime is 21739129. The reversal of 21739119 is 91193712.

It is not a de Polignac number, because 21739119 - 2⁴ = 21739103 is a prime.

It is a super-2 number, since 2×21739119² = 945178589792322, 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 21739119.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21739129) 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, 38332 + ... + 38894.

It is an arithmetic number, because the mean of its divisors is an integer number (1853304).

Almost surely, 2^21739119 is an apocalyptic number.

21739119 is a deficient number, since it is larger than the sum of its proper divisors (7913745).

21739119 is a wasteful number, since it uses less digits than its factorization.

21739119 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838.

The product of its digits is 3402, while the sum is 33.

The square root of 21739119 is about 4662.5228149576. The cubic root of 21739119 is about 279.0919520657.

The spelling of 21739119 in words is "twenty-one million, seven hundred thirty-nine thousand, one hundred nineteen".