21077419 has 4 divisors (see below), whose sum is σ = 22993560. Its totient is φ = 19161280.

The previous prime is 21077401. The next prime is 21077431. The reversal of 21077419 is 91477012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21077419 - 2¹¹ = 21075371 is a prime.

It is a super-2 number, since 2×21077419² = 888515183403122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21077449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 958054 + ... + 958075.

It is an arithmetic number, because the mean of its divisors is an integer number (5748390).

Almost surely, 2^21077419 is an apocalyptic number.

21077419 is a deficient number, since it is larger than the sum of its proper divisors (1916141).

21077419 is a wasteful number, since it uses less digits than its factorization.

21077419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1916140.

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 21077419 is about 4591.0150293808. The cubic root of 21077419 is about 276.2310386035.

The spelling of 21077419 in words is "twenty-one million, seventy-seven thousand, four hundred nineteen".