21479722 has 8 divisors (see below), whose sum is σ = 35148672. Its totient is φ = 9763500.

The previous prime is 21479693. The next prime is 21479729. The reversal of 21479722 is 22797412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21479722² = 922756914394568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21479729) 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 3 ways as a sum of consecutive naturals, for example, 488154 + ... + 488197.

It is an arithmetic number, because the mean of its divisors is an integer number (4393584).

Almost surely, 2^21479722 is an apocalyptic number.

21479722 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21479722 is a deficient number, since it is larger than the sum of its proper divisors (13668950).

21479722 is a wasteful number, since it uses less digits than its factorization.

21479722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976364.

The product of its digits is 14112, while the sum is 34.

The square root of 21479722 is about 4634.6220989418. The cubic root of 21479722 is about 277.9774406758.

It can be divided in two parts, 21479 and 722, that added together give a square (22201 = 149²).

The spelling of 21479722 in words is "twenty-one million, four hundred seventy-nine thousand, seven hundred twenty-two".