21632070 has 32 divisors (see below), whose sum is σ = 54650880. Its totient is φ = 5464800.

The previous prime is 21632063. The next prime is 21632071. The reversal of 21632070 is 7023612.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21632071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18406 + ... + 19545.

It is an arithmetic number, because the mean of its divisors is an integer number (1707840).

Almost surely, 2^21632070 is an apocalyptic number.

21632070 is an abundant number, since it is smaller than the sum of its proper divisors (33018810).

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

21632070 is a wasteful number, since it uses less digits than its factorization.

21632070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37980.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 21632070 is about 4651.0289184222. The cubic root of 21632070 is about 278.6330912619.

Adding to 21632070 its reverse (7023612), we get a palindrome (28655682).

The spelling of 21632070 in words is "twenty-one million, six hundred thirty-two thousand, seventy".