21196164 has 48 divisors (see below), whose sum is σ = 54512640. Its totient is φ = 6356640.

The previous prime is 21196159. The next prime is 21196169. The reversal of 21196164 is 46169112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21196159) and next prime (21196169).

It is not an unprimeable number, because it can be changed into a prime (21196169) 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, 12817 + ... + 14375.

It is an arithmetic number, because the mean of its divisors is an integer number (1135680).

Almost surely, 2^21196164 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21196164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27256320).

21196164 is an abundant number, since it is smaller than the sum of its proper divisors (33316476).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21196164 is a wasteful number, since it uses less digits than its factorization.

21196164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1680 (or 1678 counting only the distinct ones).

The product of its digits is 2592, while the sum is 30.

The square root of 21196164 is about 4603.9291914624. The cubic root of 21196164 is about 276.7488067587.

The spelling of 21196164 in words is "twenty-one million, one hundred ninety-six thousand, one hundred sixty-four".