21377419 has 16 divisors (see below), whose sum is σ = 25643520. Its totient is φ = 17457000.

The previous prime is 21377417. The next prime is 21377459. The reversal of 21377419 is 91477312.

It is not a de Polignac number, because 21377419 - 2¹ = 21377417 is a prime.

It is a super-2 number, since 2×21377419² = 913988086203122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21377417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85044 + ... + 85294.

It is an arithmetic number, because the mean of its divisors is an integer number (1602720).

Almost surely, 2^21377419 is an apocalyptic number.

21377419 is a deficient number, since it is larger than the sum of its proper divisors (4266101).

21377419 is an frugal number, since it uses more digits than its factorization.

21377419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327 (or 281 counting only the distinct ones).

The product of its digits is 10584, while the sum is 34.

The square root of 21377419 is about 4623.5721039041. The cubic root of 21377419 is about 277.5354238792.

The spelling of 21377419 in words is "twenty-one million, three hundred seventy-seven thousand, four hundred nineteen".