21447422 has 16 divisors (see below), whose sum is σ = 32659200. Its totient is φ = 10562520.

The previous prime is 21447407. The next prime is 21447427. The reversal of 21447422 is 22474412.

It is a junction number, because it is equal to n+sod(n) for n = 21447391 and 21447400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21447427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49547 + ... + 49977.

It is an arithmetic number, because the mean of its divisors is an integer number (2041200).

Almost surely, 2^21447422 is an apocalyptic number.

21447422 is a deficient number, since it is larger than the sum of its proper divisors (11211778).

21447422 is a wasteful number, since it uses less digits than its factorization.

21447422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751.

The product of its digits is 3584, while the sum is 26.

The square root of 21447422 is about 4631.1361456990. The cubic root of 21447422 is about 277.8380351528.

The spelling of 21447422 in words is "twenty-one million, four hundred forty-seven thousand, four hundred twenty-two".