21596970 has 96 divisors (see below), whose sum is σ = 57293568. Its totient is φ = 5204992.

The previous prime is 21596969. The next prime is 21596983. The reversal of 21596970 is 7969512.

It is a super-2 number, since 2×21596970² = 932858226361800, which contains 22 as substring.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 407464 + ... + 407516.

It is an arithmetic number, because the mean of its divisors is an integer number (596808).

Almost surely, 2^21596970 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21596970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28646784).

21596970 is an abundant number, since it is smaller than the sum of its proper divisors (35696598).

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

21596970 is a wasteful number, since it uses less digits than its factorization.

21596970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144 (or 127 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 21596970 is about 4647.2540279180. The cubic root of 21596970 is about 278.4823071725.

The spelling of 21596970 in words is "twenty-one million, five hundred ninety-six thousand, nine hundred seventy".