21196377 has 16 divisors (see below), whose sum is σ = 32134080. Its totient is φ = 13801536.

The previous prime is 21196349. The next prime is 21196397. The reversal of 21196377 is 77369112.

It is a happy number.

21196377 is a `hidden beast` number, since 2 + 1 + 19 + 637 + 7 = 666.

It is not a de Polignac number, because 21196377 - 2⁶ = 21196313 is a prime.

It is a super-2 number, since 2×21196377² = 898572795852258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21196327) 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 15 ways as a sum of consecutive naturals, for example, 7968 + ... + 10289.

It is an arithmetic number, because the mean of its divisors is an integer number (2008380).

Almost surely, 2^21196377 is an apocalyptic number.

21196377 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

21196377 is a deficient number, since it is larger than the sum of its proper divisors (10937703).

21196377 is a wasteful number, since it uses less digits than its factorization.

21196377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18309 (or 18303 counting only the distinct ones).

The product of its digits is 15876, while the sum is 36.

The square root of 21196377 is about 4603.9523238192. The cubic root of 21196377 is about 276.7497337708.

The spelling of 21196377 in words is "twenty-one million, one hundred ninety-six thousand, three hundred seventy-seven".