21632022 has 40 divisors (see below), whose sum is σ = 49219896. Its totient is φ = 7099488.

The previous prime is 21631997. The next prime is 21632059. The reversal of 21632022 is 22023612.

21632022 = 169² + 170² + ... + 411².

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21631986 and 21632004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9858 + ... + 11850.

Almost surely, 2^21632022 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21632022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24609948).

21632022 is an abundant number, since it is smaller than the sum of its proper divisors (27587874).

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

21632022 is a wasteful number, since it uses less digits than its factorization.

21632022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2074 (or 2065 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 21632022 is about 4651.0237582709. The cubic root of 21632022 is about 278.6328851729.

Adding to 21632022 its reverse (22023612), we get a palindrome (43655634).

The spelling of 21632022 in words is "twenty-one million, six hundred thirty-two thousand, twenty-two".